微型燃气轮机用CW原表面回热器蠕变分析  

CREEP ANALYSIS FOR CROSS WAVY PRIMARY SURFACE RECUPERATOR IN 100 kW MICROTURBINE SYSTEM

作　　者：张冬洁[1] 王军伟[1] 曾敏[1] 王秋旺[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《工程热物理学报》2008年第4期671-673,共3页Journal of Engineering Thermophysics

基　　金：国家"863计划"能源技术领域燃气轮机重大专项(No.2007AA050501);教育部霍英东教育基金会高等院校青年教师基金项目(No.91056)

摘　　要：高效紧凑式微型燃气轮机用原表面回热器,长期处于高温高压工作环境,换热片材料会随着工作时间延长而发生不可恢复的塑性变形(即蠕变).发生蠕变后,气流通道变形严重,气流流通不畅,甚至会造成换热片破裂,导致回热器报废.本文应用隐式蠕变Norton方程分析了CW(Cross Wavy)原表面回热器在工作条件下运行40000 h后的蠕变情况,验证了换热器材料的可靠性,发现空气和燃气通道的压差是产生蠕变的主要原因,并提出了合理的压差范围和有效预防蠕变的通道结构型式,通过对不同材料蠕变情况的对比,建议回热器应选用含有抗蠕变金属Nb的不锈钢材料制造.Recuperator is a compact and high efficiency heat exchanger working at high temperature and high pressure conditions. Creep deformation may occur in the passages of the compact primary sheet with the increase of the operation time. Inside the recuperator creep deformation causes the compressor discharge air passages to expand, thus restricting exhaust gas flow and increasing the turbine backpressure. This will deteriorate the flow and heat transfer performance of the recuperator, even affect the whole safe operation of the turbine system. In this paper, with the implicit Norton function, the creep deformation of CW recuperator （after working 40000 hours） is analyzed to prove the reliability of material, and it is found that the pressure difference between the air and the gas is the main reason to cause creep deformation of the sheet. The proper operation parameters, material and the best configuration of the passages are suggested.

关 键 词：微型燃气轮机 回热器 CW原表面 蠕变 

分 类 号：TK124[动力工程及工程热物理—工程热物理]