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前部转动导叶可调涡轮泄漏与激波特性研究 被引量:2
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作者 王凯 杨登峰 +3 位作者 王怀雨 朱正灿 张前 Hu Leon 《风机技术》 2022年第S01期10-16,共7页
可调涡轮导叶与蜗壳存在端壁间隙,在大膨胀比导叶小开度时,产生的强间隙泄漏流使涡轮效率大幅降低。为抑制导叶尾缘区域的间隙泄漏流量,提出了一种前部转动导叶,并将其数值计算结果和原始模型进行了比对。结果表明:小开度下,前部转动导... 可调涡轮导叶与蜗壳存在端壁间隙,在大膨胀比导叶小开度时,产生的强间隙泄漏流使涡轮效率大幅降低。为抑制导叶尾缘区域的间隙泄漏流量,提出了一种前部转动导叶,并将其数值计算结果和原始模型进行了比对。结果表明:小开度下,前部转动导叶可有效抑制间隙泄漏流量,涡轮性能提升了13个百分点;而随着导叶开度的增大,泄漏占涡轮总损失程度降低,前部转动导叶带来的效率收益也随之减小。在可调涡轮中间开度下,前部转动导叶可通过增加转/静间距而使激波强度弱化,并降低因激波和泄漏流所引发的转静干涉强度,从而提升涡轮叶片的可靠性。 展开更多
关键词 可调涡轮 前部转动导叶 间隙泄漏流 效率
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Potentials of marine natural products against malaria, leishmaniasis, and trypanosomiasis parasites: a review of recent articles
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作者 Justus Amuche Nweze Florence N.Mbaoji +7 位作者 Yan-Ming Li Li-Yan yang Shu-Shi Huang Vincent N.Chigor Emmanuel A.Eze Li-Xia Pan Ting Zhang deng-feng yang 《Infectious Diseases of Poverty》 SCIE 2021年第1期95-96,共2页
Background:Malaria and neglected communicable protozoa parasitic diseases,such as leishmaniasis,and trypanosomiasis,are among the otherwise called diseases for neglected communities,which are habitual in underprivileg... Background:Malaria and neglected communicable protozoa parasitic diseases,such as leishmaniasis,and trypanosomiasis,are among the otherwise called diseases for neglected communities,which are habitual in underprivileged populations in developing tropical and subtropical regions of Africa,Asia,and the Americas.Some of the currently available therapeutic drugs have some limitations such as toxicity and questionable efficacy and long treatment period,which have encouraged resistance.These have prompted many researchers to focus on fin ding new drugs that are safe,effective,and affordable from marine environ merits.The aim of this review was to show the diversity,structural scaffolds,in-vitro or in-vivo efficacy,and recent progress made in the discovery/isolation of marine natural products(MNPs)with potent bioactivity against malaria,leishmaniasis,and trypanosomiasis.Main text:We searched PubMed and Google scholar using Boolean Operators(AND,OR,and NOT)and the combination of related terms for articles on marine natural products(MNPs)discovery published only in English language from January 2016 to June 2020.Twenty nine articles reported the isolation,identification and antiparasitic activity of the isolated compounds from marine environment.A total of 125 compounds were reported to have been isolated,out of which 45 were newly isolated compounds.These compounds were all isolated from bacteria,a fungus,sponges,algae,a bryozoan,cnidarians and soft corals.In recent years,great progress is being made on anti-malarial drug discovery from marine organisms with the isolation of these potent compounds.Comparably,some of these promising antikinetoplastid MNPs have potency better or similar to conventional drugs and could be developed as both antileishmanial and antitrypanosomal drugs.However,very few of these MNPs have a pharmaceutical destiny due to lack of the following:sustainable production of the bioactive compounds,stan da rd efficient screening methods,knowledge of the mechanism of action,partnerships between researchers and pharmaceutical industries.Conclusions:It is crystal clear that marine organisms are a rich source of antiparasitic compounds,such as alkaloids,terpenoids,peptides,polyketides,terpene,coumarins,steroids,fatty acid derivatives,and lactones.The current and future technological innovation in natural products drug discovery will bolster the drug armamentarium for malaria and neglected tropical diseases. 展开更多
关键词 Marine natural products Neglected tropical diseases Anti-trypanosoma Anti-leishmania Anti-plasmodia Protozoa parasites
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