Aerodynamic design of high end wall angle turbine stages-part I: Methodology development

A design methodology is presented for turbines in an annulus with high end wall angles. Such stages occur where large radial offsets between the stage inlet and stage outlet are required, for example in the first stage of modern low pressure turbines, and are becoming more prevalent as bypass ratios increase. The turbine vanes operate within s-shaped ducts which result in meridional curvature being of a similar magnitude to the bladeto-blade curvature. Through a systematic series of idealized computational cases, the importance of two aspects of vane design are shown. First, the region of peak end wall meridional curvature is best located within the vane row. Second, the vane should be leant so as to minimize spanwise variations in surface pressure-this condition is termed "ideal lean." This design philosophy is applied to the first stage of a low pressure turbine with high end wall angles. © 2014 by ASME.

Improving intermediate pressure turbine performance by using a nonorthogonal stator

Intermediate pressure (IP) turbines in high bypass ratio civil aeroengines are characterized by a significant increase in radius and a low aspect ratio stator. Conventional aerodynamic designs for the IP turbine stator have had leading and trailing edges orthogonal to the hub and casing end walls. The IP turbine rotor, however, is stacked radially due to stress limits. These choices inevitably lead to a substantial gap between the IP stator and rotor at the outer diameter in a duct that is generally diffusing the flow due to the increasing radius. In this low Mach number study, the IP stator is redesigned, incorporating compound sweep so that the leading and trailing edges are no longer orthogonal to the end walls. Computational investigations showed that the nonorthogonal stator reduces the flow diffusion between the stator and rotor, which yields two benefits: The stator trailing edge velocity was reduced, as was the boundary layer growth on the casing end wall within the gap. Experimental measurements confirm that the turbine with the nonorthogonal stator has an increased efficiency by 0.49%, while also increasing the work output by 4.6%, at the design point. © 2014 by ASME.

Aerodynamic design of high end wall angle turbine stages- part II: Experimental verification

An experimental investigation of a turbine stage featuring very high end wall angles is presented. The initial turbine design did not achieve a satisfactory performance and the difference between the design predictions and the test results was traced to a large separated region on the rear suction-surface. To improve the agreement between computational fluid dynamics (CFD) and experiment, it was found necessary to modify the turbulence modeling employed. The modified CFD code was then used to redesign the vane, and the changes made are described. When tested, the performance of the redesigned vane was found to have much closer agreement with the predictions than the initial vane. Finally, the flowfield and performance of the redesigned stage are compared to a similar turbine, designed to perform the same duty, which lies in an annulus of moderate end wall angles. A reduction in stage efficiency of at least 2.4% was estimated for the very high end wall angle design. © 2014 by ASME.

The effect of clearance on shrouded and unshrouded turbines at two levels of reaction

In this paper, the effect of seal clearance on the efficiency of a turbine with a shrouded rotor is compared with the effect of the tip clearance when the same turbine has an unshrouded rotor. The shrouded versus unshrouded comparison was undertaken for two turbine stage designs one having 50% reaction, the other having 24% reaction. Measurements for a range of clearances, including very small clearances, showed three important phenomena. Firstly, as the clearance is reduced, there is a "break-even clearance" at which both the shrouded turbine and the unshrouded turbine have the same efficiency. If the clearance is reduced further, the unshrouded turbine performs better than the shrouded turbine, with the difference at zero clearance termed the "offset loss." This is contrary to the traditional assumption that both shrouded and unshrouded turbines have the same efficiency at zero clearance. The physics of the break-even clearance and the offset loss are discussed. Secondly, the use of a lower reaction had the effect of reducing the tip leakage efficiency penalty for both the shrouded and the unshrouded turbines. In order to understand the effect of reaction on the tip leakage, an analytical model was used and it was found that the tip leakage efficiency penalty should be understood as the dissipated kinetic energy rather than either the tip leakage mass flow rate or the tip leakage loss coefficient. Thirdly, it was also observed that, at a fixed flow coefficient, the fractional change in the output power with clearance was approximately twice the fractional change in efficiency with clearance. This was explained by using an analytical model. © 2014 by ASME.

Culture of the terrestrial cyanobacterium, Nostoc flagelliforme (Cyanophyceae), under aquatic conditions

Both colonies and free-living cells of the terrestrial cyanobacterium, Nostoc flagelliforme (Berk. & Curtis) Bornet & Flahault, were cultured under aquatic conditions to develop the techniques for the cultivation and restoration of this endangered resource. The colonial filaments disintegrated with their sheaths ruptured in about 2 days without any desiccating treatments. Periodic desiccation played an important role in preventing the alga from decomposing, with greater delays to sheath rupture with a higher frequency of exposure to air. The bacterial numbers in the culture treated with seven periods of desiccation per day were about 50% less compared with the cultures without the desiccation treatment. When bacteria in the culture were controlled, the colonial filaments did not disintegrate and maintained the integrity of their sheath for about 20 days even without the desiccation treatments, indicating the importance of desiccation for N. flagelliforme to prevent them from being disintegrated by bacteria. On the other hand, when free-living cells obtained from crushed colonial filaments were cultured in liquid medium, they developed into single filaments with sheaths, within which multiple filaments were formed later on as a colony. Such colonial filaments were developed at 15, 25, and 30degreesC at either 20 or 60 mumol photons.m(-2).s(-1); colonies did not develop at 180 mumol photons.m(-2).s(-1), though this light level resulted in the most rapid growth of the cells. Conditions of 60 mumol photons.m(-2).s(-1) and 25degrees C appeared to result in the best colonial development and faster growth of the sheath-held colonies of N. flagelliforme when cultured indoor under aquatic conditions.

Studies on polysaccharides from three edible species of Nostoc (Cyanobacteria) with different colony morphologies: Comparison of monosaccharide compositions and viscosities of polysaccharides from field colonies and suspension cultures

Hot water-soluble polysaccharides woe extracted from field colonies and suspension cultures of Nostoc commune Vaucher, Nostoc flagelliforme Berkeley et Curtis, and Nostoc sphaeroides Kutzing. Excreted extracellular polymeric substances (EPS) were isolated from the media in which the suspension cultures were grown. The main monosaccharides of the field colony polysaccharides from the three species were glucose, xylose, and galactose, with an approximate ratio of 2:1:1. Mannose was also present, but the levels varied among the species, and arabinose appeared only in N. flagelliforme. The compositions of the cellular polysaccharides and EPS from suspension cultures were more complicated than those of the field samples and varied among the different species. The polysaccharides from the cultures of N. flagelliforme had a relatively simple composition consisting of mannose, galactose, glucose, and glucuronic acid, but no xylose, as was found in the field colony polysaccharides. The polysaccharides from cultures of N. sphaeroides contained glucose (the major component), rhamnose, fucose, xylose, mannose, and galactose. These same sugars were present in the polysaccharides from cultures of N. commune, with xylose as the major component. Combined nitrogen in the media had no qualitative influence on the compositions of the cellular polysaccharides but affected those of the EPS of N. commune and N. flagelliforme. The EPS of N. sphaeroides had a very low fetal carbohydrate content and thus was not considered to be polysaccharide in nature. The field colony polysaccharides could be separated by anion exchange chromatography into neutral and acidic fractions having similar sugar compositions. Preliminary linkage analysis showed that 1) xylose, glucose, and galactose were 1-->4 linked, 2) mannose, galactose, and xylose occurred as terminal residues, and 3) branch points occurred in glucose as 1-->3,4 and 1-->3,6 linkages and in xylose as a 1-->3,4 linkage. The polymer preparations from field colonies had higher kinematic viscosities than those from corresponding suspension cultures. The high viscosities of the polymers suggested that they might DE suitable for industrial uses.

华东地区木材腐朽菌多样性与资源研究

木材腐朽菌是生物多样性的重要组成部分，在森林生态系统中起着关键的降解还原作用；同时，木材腐朽菌还是重要的生物资源，与人类的生产与生活密切相关，具有重要的经济价值。因此，木腐菌一直是真菌研究的重点领域之一，然而过去对华东地区木腐菌的研究还非常薄弱，对华东地区木腐菌的种类和资源还缺乏清晰的认识。本文对华东地区不同森林生态类型中的木腐菌进行了广泛的调查采样，通过形态学、分子系统学和单孢融合交配实验，对华东地区的木腐菌多样性与资源进行了系统的研究，同时对具有重要经济意义和潜在应用价值的种类进行了菌种的分离保藏，并初步分析了华东地区木腐菌的区系特点。通过本论文的研究，提高了对华东地区木腐菌资源与多样性的认识，丰富了我国木材腐朽菌的种类，为控制林木病原菌、开发利用有益真菌资源提供了基本信息和科学依据。本论文的主要研究结论如下： 1．华东地区的木腐菌有3目13科92属270种，其中真菌新种6个，分别是：铁杉集毛孔菌Coltricia tsugicola Y.C. Dai & B.K. Cui，香榧嗜蓝孢孔菌Fomitiporia torreyae Y.C. Dai & B.K. Cui，拟囊状体大孔菌Megasporoporia cystidiolophora B.K. Cui & Y.C. Dai，菌索多年卧孔菌Perenniporia rhizomorpha B.K. Cui, Y.C. Dai & Decock，微小硬孔菌Rigidoporus minutus B.K. Cui & Y.C. Dai，浅黄芮氏孔菌Wrightoporia luteola B.K. Cui & Y.C. Dai；中国新记录种9个，分别是：紫多孢孔菌Abundisporus violaceus (Wakef.) Ryvarden，卡玛蜡孔菌Ceriporia camaresiana (Bourdot & Galzin) Bondartsev & Singer，撕裂蜡孔菌Ceriporia lacerata N. Maek., Suhara & R. Kondo，塔斯马尼亚集毛孔菌Coltriciella tasmanica (Cleland & Rodway) D.A. Reid，瑞克纤孔菌Inonotus rickii (Pat.) D.A. Reid，骨质多年卧孔菌Perenniporia minutissima (Yasuda) T. Hatt. & Ryvarden，灰硬孔菌Rigidoporus cinereus Núñez & Ryvarden，凹形栓孔菌Trametes ectypus (Berk. & M.A. Curtis) Gilb. & Ryvarden，变形干酪菌Tyromyces transformatus Núñez & Ryvarden。 2．利用分子系统学方法，确定了一些通过形态学研究难以鉴定或容易混淆的种类的分类地位，并对嗜蓝孢孔菌属、彩孔菌属和多年卧孔菌属进行了系统发育分析，发现木腐菌新种3个：Fomitiporia sp.、Hapalopilus sp. 和Perenniporia sp.。 3．华东地区的异担子菌为岛生异担子菌，并且存在两个生物种：T生物种和Y生物种。T生物种为腐生菌，Y生物种为兼性腐生菌，华东地区不存在多年异担子菌这一严重的森林病原菌。 4．华东地区的木腐菌种类丰富，组成复杂多样。优势科为多孔菌科，其次为锈革孔菌科，这两科的种类构成了华东地区木腐菌类区系的主体；优势属主要有多年卧孔菌属、多孔菌属、针层孔菌属和泊氏孔菌属。 4．华东地区木腐菌科的地理成分分为3类：热带亚热带成分，北温带成分和世界广布成分，以世界广布成分为主。属的地理成分分为5类：世界广布属，北温带分布属，热带–亚热带分布属，东亚–北美分布属，大洋洲–北温带分布属，以世界广布属和北温带分布属为主。种的地理成分分为8类：世界广布种，北温带分布成分，泛热带分布成分，亚–欧共有成分，东亚–北美共有成分，东亚–澳大利亚共有成分，东亚成分，中国特有种，以北温带分布种和世界广布种为主。 5．华东地区木腐菌的各主要区系成分均有分布，以世界广布成分和北温带成分为主，表现出明显的北温带性质，可能起源于北半球，华东地区木腐菌类的区系地理成分与其所处的地理位置、气候特点与植物区系的组成密切相关。此外，华东地区的中国特有种类也较为丰富，说明了华东地区木腐菌类的区系具有一定的独特性，也在一定程度上反映了华东地区生态环境条件的特殊性，而木腐菌的生长与环境条件和寄主树木种类有很大的关系。 6．华东地区的木腐菌资源非常丰富，林木病原菌有36种，其中新发现的病原菌有3种；野生的食用木腐菌有11种，野生的药用木腐菌64种，工业用木腐菌有28种。对其中的一种重要经济真菌——黄白多年卧孔菌进行了分离培养，找出了最佳生长条件：最适生长温度为25℃左右，相对最适pH值为5.5，相对最好的碳源为可溶性淀粉和葡萄糖，相对最好的氮源为酵母汁。

广西主要林区多孔菌生物多样性与资源的初步研究

广西壮族自治区是中国多孔菌资源比较丰富的区域之一，本研究对广西主要林区进行了初步调查，并根据形态学研究方法对广西地区的多孔菌进行了系统分类学研究。 结果显示，广西地区的多孔菌共有15科，60属，140种。研究过程中发现两个新种，分别是菌索容氏孔菌Junghuhnia rhizomorpha H.S. Yuan & Y.C. Dai和小孔大孢卧孔菌Megasporoporia microporela X.S. Zhou &Y.C. Dai；发现7个中国新记录种：萨拉氏灵芝Ganoderma sarasinii Steyaert，唐氏胶囊革菌Gloeocystidiellum donkii S.S. Rattan，线浅孔菌Grammothele lineata Berkeley & M.A. Curtis，粉状捷克革菌Jacksonomyces furfurellus (Bres.) Sheng H. Wu & Z.C. Chen，半伏容氏孔菌Junghuhnia separabilima (Pouzar) Ryvarden，非洲纵隔担孔菌Protomerulius africanus (Ryvarden) Ryvarden和日本芮氏孔菌Wrightoporia japonica Núñez & Ryvarden；78种为广西地区新记录种，占该地区已报道种类的55.7%。 依据分类学的研究结果，对广西地区的多孔菌的种类组成和地理成分进行了初步分析，结果显示，优势科为多孔菌科Polyporaceae（33.3%），其次为皱孔菌科Meripilaceae（10%），优势属为多孔菌属Polyporus（7.9%%）和针层孔菌属Phellinus（5.7%）；属的地理成分以世界广布属（68.3%）和热带–亚热带分布属（23.3%）为主，种的地理成分以泛热带分布成分（35%）和世界广布种（30%）为主。 经研究表明广西地区共有森林干基腐朽病原多孔菌21种，食用多孔菌菌有5种，药用多孔菌32种，工业用多孔菌17种，多孔菌资源较丰富。 对重要种类木蹄层孔菌Fomes fomentarius (L.:Fr.) Fr.进行了固体培养研究，结果显示木蹄层孔菌的营养菌丝生长最适培养温度为28℃，最适培养pH值为7，最适培养碳源为蔗糖，最适培养氮源为蛋白胨。

板栗心材褐腐病初报

为了确定华中地区板栗(Castaneamollisima)心材腐朽病的病原菌,根据野外调查结果和室内显微鉴定,确定该病原菌为硬拟层孔菌(Fomitopsisspraguei(Berk.&M.A.Curtis)Gilb.&Ryvarden)。该菌主要危害板栗活树,造成心材褐色腐朽,最终导致受害树木死亡或风折后死亡。同时根据采集的标本,对该病原菌进行了详细描述和显微绘图。

长白山北坡植被垂直带群落交错区的定量判定

以海拔梯度上的群落重要值和二元数据为指标 ,采用游动分割窗技术辨析了长白山北坡各植被带群落交错区的位置和宽度 .结果表明 ,采用平方欧氏距离 (SED)和Bray Curtis距离函数 (PD)计算的游动分割窗的峰值和峰宽有较好的重合性 ,其中基于灌木和草本物种重要值的平方欧氏距离更能准确地反映交错带植被的变异 .依据游动分割窗的分析 ,判定阔叶红松林和暗针叶林的交错区为渐变类型 ,位于海拔 112 0m ,宽度为 2 0 0m ,暗针叶林和岳桦交错区为急变类型 ,位于海拔 1790m ,宽度为 5 0m ,林线为急变类型 ,位于海拔 2 0 0 0m ,宽度为 4 0m .

长白山森林生态系统中的稀有和濒危多孔菌

In last 10 years,extensive field inventories were carried out to investigate Polypore species, the major wood decaying fungi in the Changbaishan Nature Reserve of Northeastern China. The following 27 species were treated as rare or threathened species: Amylocystis lapponica (Romell) Singer, Anomoporia albolutescens (Romell) Pouzar, Anomoporia bombycina (Fr.) Pouzar, Anomoporia vesiculosa Y.C. Dai & Niemel, Antrodia carbonica (Overh.) Ryvarden & Gilb., Antrodia crassa (P. Karst.) Ryvarden, Antrodiella citrinella Niemel & Ryvarden, Diplomitoporus flavescens (Bres.) Dománski, Donkioporia expansa (Desm.) Kotl. & Pouzar, Gloeophyllum carbonarium (Berk. & M.A. Curtis) Ryvarden, Haploporus odorus (Sommerf.) Bondartsev & Singer, Inonotopsis subiculosa (Peck) Parmasto, Nigroporus ussuriensis (Bondartsev & Ljub.) Y.C. Dai & Niemela, Oxyporus sinensis X.L. Zeng, Parmastomyces taxi (Bondartsev) Y.C. Dai & Niemela, Phellinidium sulphurascens (Pilat) Y.C. Dai, Phellinus vaninii Ljub., Polyporus vassilievae Thorn, Pycnoporellus fulgens (Fr.) Donk, Skeletocutis brevispora Niemela, Skeletocutis ochroalba Niemela, Skeletocutis perennis Ryvarden, Trechispora candidissima (Schwein.) Bondartsev & Singer, Wolfiporia dilatohypha Ryvarden & Gilb., Wolfiporia curvispora Y.C. Dai, Wrightoporia avellanea (Bres.) Pouzar and Wrightoporia lenta (Oveh. & J. Lowe) Pouzar. Polypores are richer in East Asia than in Europe and North America, not only because of destructive galciations and fewer hosts in the latters, but also because of the geography. NE Asia is a link between Europe and North America. Changbaishan Nature Reserve is very rich in polypores, and over 260 species were recorded in the reserve. Some rare species in North America and Europe, for instance, Anomoporia albolutescens, Antrodia crassa, Diplomitoporus flavescens, Inonotopsis subiculosa and Skeletocutis ochroalba etc. were found in Changbaishan Nature Reserve as well, and these species are in fact rare in the earth. Most of the 27 species occurred on fallen trunks or rotten wood in the reserve, but some of them grew on living trees. 18 species occured on substrate of gymnosperms, and 9 species grew on wood of angiosperm.Among the 27 species, 7 species caused a brown rot,and 20 species produced a white rot. The morphology, substrate and ecology of each species were briefly discussed. The most important tool for polypore conservation is the conservation of their habitats, and it is necessary to study the ecology of the rare and threathened species of polypores in the Changbaishan Nature Reserve. Because most of polypores live on the substrate of fallen trunks and rotten wood, it is very important to keep such substrate in the ecosystem.

中国锈革孔菌科一新记录种

A lignicolous fungus,Hydnochaete tabacina(Berk.& M.A.Curtis) Ryvarden,was newly recorded from China,it was found on Quercus variabilis in Beijing.An illustrated description of this species was given based on the materials related.

Resumos...

Análise proteômica de raízes de feijão (Phaseolus vulgaris) inoculadas com Rhizobium tropici. Teste para comprovar a eficiência do método de extração e determinação de ácido fítico em sementes de soja utilizado na Embrapa Soja. Auditoria de comunicação: avaliando os veículos de comunicação interna da Embrapa Soja. Utilização da técnica de espectrofotometria do infravermelho próximo (NIR) para análise discriminante dos ácidos graxos oléico e linoléico de genótipos de girassol. Análise da disponibilidade hídrica para a cultura da soja nas safras 2004/05 e 2009/10 em Londrina, PR . Calibração de psicrômetros para avaliações de potencial hídrico foliar. Avaliação de ácidos graxos da soja: grão inteiro, casca, cotilédones e hipocótilo. Variabilidade temporal da produtividade da soja após conversão do preparo convencional para o sistema plantio direto. COMUT na biblioteca da Embrapa Soja. EM DIA: Boletim interno compartilhando informações. Sistema Web para estimativas de perdas por seca na cultura da soja. Portais Web desenvolvidos no laboratório de Bioinformática da Embrapa Soja. Validação de um método para detecção e quantificação de soja cultivance® tolerante a herbicidas imidazolinonas por PCR . Índice de vegetação por diferença normalizada (NDVI) de cultivares de soja sob três níveis de disponibilidade hídrica no solo. Avaliação do fluxo de seiva em cultivares de soja em três níveis de disponibilidade hídrica no solo. A importância do controle de qualidade dos inoculantes. Comportamento exploratório de ninfas recém eclodidas de Edessa meditabunda (F.) (Heteroptera: Pentatomidae) sobre a superfície dos córions. Produção de brotos de soja da cultivar BRS 216. Teste de aceitabilidade de brotos de soja da cultivar BRS 216. Análise de lignina com diferentes massas de tegumento de soja utilizando método gravimétrico. Desenvolvimento e caracterização físico-química de biscoitos com farinha de soja orgânica de cultivares especiais para a alimentação humana. Análise sensorial de biscoitos com farinha de soja orgânica de cultivares especiais para a alimentação humana. Avaliação de genótipos de soja de diferentes grupos de maturação e resistência aos percevejos. Métodos químicos para extração de boro no solo. Abordagem computacional para a identificação de elementos cis-regulatórios no genoma da soja. Quebra de dormência em sementes de girassol silvestre utilizando ácido giberélico. Teor relativo de água em cultivares de soja sob três níveis de disponibilidade hídrica no solo. Soybean gene express: plataforma para análise de expressão diferencial em bibliotecas subtrativas de CDNA. Biologia e exigências térmicas do ácaro vermelho Tetranychus gigas. Características biológicas de Telenomus remus em diferentes hospedeiros após serem criados em de ovos de Anticarsia gemmatalis e Spodoptera frugiperda por uma geração. Enfoque sobre o plano de saúde dos empregados da Embrapa no contexto do pacote de benefícios sociais oferecidos pela empresa. Dinâmica populacional do ácaro verde Mononychellus planki em cultivares de soja. Envelhecimento, trabalho e tempo livre: elaborando projetos de vida. Teor de isoflavonas em vinte cultivares de soja semeadas em Londrina e Ponta Grossa. Utilização de Pseudomonas fluorescens no controle biológico de Macrophomina phaseolina. Algoritmo computacional para determinar o perfil mínimo de marcadores moleculares que discriminam um conjunto de cultivares. Qualidade física do solo em um sistema de integração lavoura-pecuária com diferentes pressões de pastejo. Diversidade de estirpes do gênero Burkholderia em solos do cerrado brasileiro baseado no sequenciamento do gene ribossomal 16S. Estudo da diversidade genética de isolados de Corynespora cassiicola (Berk. & M.A. Curtis) C.T. Wei.