变几何变工质涡轮性能预测及变工况性能计算

CHARACTERISTICS CALCULATION AT DESIGN AND OFF-DESIGN FOR TURBINE WITH VARIABLE GEOMETRY AND MEDIUM

关键词:  涡轮  变几何形状结构  工作介质  性能预测  数值计算

Key words:  Turbine  Variable geometry structure  Working medium  Performance prediction  Numerical calculation

摘要:

为适应涡轮在变工质，大变工况条件下的性能预测，研究了工质的性质，涡轮各种损失与涡轮流通通道内的临界堵塞流动，变几何涡轮的性能计算方法。这些研究的结果是变几何变工质涡轮理论分析的有用工具。

Abstract:

ngine in space shuttle works in variable condition, from Mach number zero to Machnumber 3￣ 3. 5. So turbine works at off-design condition. The performance of engine is dependent oncharacter of turbine at off-design. The variable geometric turbine is an effective method of increasingefficiency and improving match of turbine with other parts of engine. In this paper, the calculatingmethod of medium property, turbine loss and critical flow condition, and the characteristics of variablegeometry turbine are researched. These method are useful for design and analysis of variable geometricturbines.