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(一)引言在燃气轮机发展过程中,涡轮变几何一直是引人注目的问题。汽车燃气轮机部分负荷性能的改善,船用燃气轮机低工况性能的提高和倒车问题的解决以及航空发动机中变循环原理的实现都对涡轮变几何寄予很大的希望。在航空涡喷或涡扇发动机船用化改型工作中,为了尽可能地发挥原型机的潜力,也即在不超温、不超转、压气机稳定工作的条件下使改型发动机能发出尽可能大的有效功率并取得较为满意的耗油指标,往往也要借助于涡轮导叶几何参数的变化。因此,对总体性能研究者来说,拟制一
(A) Introduction Turbine geometry has always been a conspicuous problem in the development of gas turbines. The improvement of the partial load performance of automobile gas turbines, the improvement of low working conditions of marine gas turbines, the solution of reversing problems and the realization of the variable circulation principle in aero engines all place great hopes on the turbine geometry. In the aviation vortex jet or turbofan engine marine transformation work, in order to maximize the potential of the prototype, that is not over-temperature, not over-run, the compressor under the conditions of stable operation of the modified engine can be exhausted Possible large effective power and get more satisfactory fuel consumption indicators, often with the help of turbine guide vane geometrical parameters change. Therefore, for the overall performance of researchers, to prepare a