IC循环船用燃气轮机的可行性研究

从总体上分析了不同典型燃气轮机循环参数下采用间冷循环(IC)所能获得的性能。在此基础上,针对一台大功率简单循环船用燃气轮机(MGT-33)开展了将其派生为一型间冷循环船用燃气轮机的研究,前提是原发动机燃气发生器的通流部分和结构绝大部分保持不变,以继承原机的可靠性。研究表明,采用间冷循环后,在结构改动最小和保持整机紧凑性的前提下,燃气轮机的总体性能仍有明显的提高,功率增加约34%,效率提高约4.1%,具有工程实施价值。

Performance assessment of simple and modified cycle turboshaft gas turbines

This paper focuses on investigations encompassing comparative assessment of gasturbine cycle options.More specifically,investigation was caried out of technical performanceof turboshaft engine cycles based on existing simple cycle(SC)and its projected modifiedcycles for civil helicopter application.Technically,thermal efficiency,specific fuel consump-tion,and power output are of paramount importance to the overall performance of gas urbineengines.In course of carrying out this research,turbomatch software established at CranfieldUniversity based on gas turbine theory was applied to conduct simulation of a simple cycle(baseline)two-spool helicopter turboshaft engine model with free power turbine.Similarly,some modified gas urbine cycle configurations incoporating unconventional components,such as engine cycle with low pressure compressor(LPC)zero-staged,recuperated enginecycle,and intercooled/recuperated(ICR)engine cycle,were also simulated.In doing so,designpoint(DP)and off-design point(OD)performances of the engine models were established.Thepercentage changes in performance parameters of the modified cycle engines over the simplecycle were evaluated and it was found that to a large extent,the modified engine cycles withunconventional components exhibit better performances in terms of thermal efficiency andspecific fuel consumption than the traditional simple cycle engine.This research made use ofpublic domain open source references.

对发展大功率船用燃气轮机的新思考

提出利用成熟的简单循环船用燃气轮机将其派生为一型间冷循环大功率船用燃气轮机的新构想,并且原发动机燃气发生器的通流部分和结构大部分保持不变,以继承原机的可靠性。用1台实际发动机作为案例进行的分析研究表明,采用间冷循环,并精心匹配,在燃气轮机的功率显著增加(约28%)的同时,其效率也可略有提升(约3%),具有工程实施价值。

复杂循环船用燃气轮机间冷器的数值模拟

在间冷(IC)循环燃气轮机中,间冷器是对燃气轮机性能有重要影响的部件。为了确定机上布置间冷器结构型式,针对某船用燃气轮机提出了3种间冷器结构方案,并进行了数值模拟,经过优化,得出了较好的模拟结果。由于在计算时对模型进行了简化,压降损失的计算结果不够准确,因此又进行了小流道的模拟计算,据此对3个方案压降损失的计算结果进行了修正。

航改大功率、高效率舰船燃气轮机的技术发展途径探讨

为适应舰船战术性能和舰船吨位级别提高的要求,迫切需要研究大功率、高效率舰船燃气轮机。通过对国内外战舰主动力装置进行分析,认为中国开发40000 kW的大功率燃气轮机是十分必要的,利用现有航空发动机的技术资源优势,采用先进的间冷技术是发展大功率、高效率舰船燃气轮机的1条现实可行的技术途径,既可以提高燃气轮机在设计工况下的功率和热效率,又能保持在低工况下的高效率。

基于功率前馈的燃气轮机可转导叶角度控制规律研究

针对某型发电燃气轮机在负载突变过程中可转导叶角度与压气机转速互相耦合、控制失稳的问题,提出了“功率前馈”控制策略——即根据负载功率对可转导叶角度进行调整。首先,通过粒子群寻优算法,将压气机喘振裕度作为目标,对不同工况下的导叶角度进行寻优匹配;其次,采用“功率前馈”对燃气轮机突增负荷和甩负荷过程中的导叶角度进行调节;最后,以船用发电型间冷燃气轮机为研究对象,建立三转子燃气轮机整机模型,针对突变工况过程可转导叶角度的控制规律开展研究。结果表明:采用“功率前馈”控制模式,在突增负荷过程中,动力涡轮转速超调量减小11%,高压涡轮进口温度降低了3%;在甩负荷过程中动力涡轮转速超调量减少10%,高压涡轮进口温度超调量降低11.9%,低压压气机最小喘振裕度由0.87%提高至9.1%。