CAJ | 학술논문

为了研究某高负荷涡轮机流动特点及变工况工作特性，采用商业软件对涡轮机整级进行了数值计算，研究了涡轮机内部流场的流动特点，分析了变工况时的效率及功率变化趋势。研究结果表明，喷嘴内流动达到超音速，并有斜激波产生，动叶流道内有激波产生，造成附面层分离，产生较大的损失。同时，由于局部进气的原因，动叶叶栅内气流参数分布很不均匀，不同叶片的气动力矩相差很大。非设计工况下，落压比和转速的变化会引起涡轮机效率的显著下降。
위료연구모고부하와륜궤류동특점급변공황공작특성，채용상업연건대와륜궤정급진행료수치계산，연구료와륜궤내부류장적류동특점，분석료변공황시적효솔급공솔변화추세。연구결과표명，분취내류동체도초음속，병유사격파산생，동협류도내유격파산생，조성부면층분리，산생교대적손실。동시，유우국부진기적원인，동협협책내기류삼수분포흔불균균，불동협편적기동력구상차흔대。비설계공황하，락압비화전속적변화회인기와륜궤효솔적현저하강。
In order to investigate the flow characteristics and off-design working performance and variation pattern of a highly-laoded steam turbine , CFX was used to conduct numerical simulation of the turbine . The inner flow field characteristics were studied;and the turbine efficiency and power variation tendency were analyzed .The numerical results show that,the flow in nozzle is supersonic and produces a shock wave .In rotor passage,shock wave and boundary separation loss exist.Also,for partial admission,the flow parameters in rotor passage is uneven .The blades'aerodynamic torques are different.Under off-design working condition ,the variation in pressure ratio and rotation speed leads to notable decrease of turbine efficiency .