空气/烟气组合对波转子发动机性能的影响

Effect of fresh air/exhaust gas combination on performance of wave-rotor-topped gas turbines

针对波转子作为燃气轮机高压级构成的波转子发动机,考虑波转子普遍存在的烟气回流、空气排放现象及其形成的空气/烟气工质组合,建立热力学控制方程组,对波转子发动机总体方案进行对比和参数分析,并且基于热力循环模型分析参数影响关系的热力学原理。分析结果表明:烟气回流和空气排放的流量比例的增加会在不同程度上降低波转子发动机的循环功与热效率;烟气回流对总体性能的影响程度小于空气排放;适当提高波转子压比可以在考虑烟气回流和空气排放影响的前提下保持波转子发动机的总体性能。

For the wave-rotor-topped gas turbines,the exhaust gas recirculation and the fresh air exhaustion phenomena in wave rotors were considered and the status how the fresh air or exhaust gas splits and merges due to the phenomena was studied.The thermodynamic governing equations were derived,comparison and parametric investigation on the general designs was conducted,and regulations in the parametric investigation results were analyzed based on thermodynamic models.Results showed that:the exhaust gas recirculation and the fresh air exhaustion reduced the work output and the thermal efficiency by different degrees;the effect of the exhaust gas recirculation was smaller than the fresh air exhaustion;an appropriate increase in the wave rotor pressure ratio could keep the general performance of the wave-rotor-topped gas turbine with the effects of the exhaust gas recirculation and the fresh air exhaustion.