小型向心透平一维和三维设计分析

One and three-dimensional designs and analyses of small radial turbines

在分析各种因素对向心透平速比和反动度限制的基础上,给出了一种比较合理的速比和反动度的选择方法,并用C语言编写了小型燃气透平一维热力计算程序OCC(one-dimensional computer code),来进行向心透平的热力计算.通过与已发表文献中的一维热力计算程序OFC(one-dimensional computer FOR-TRAN code)结果进行比较,发现两者结果基本一致,且OCC设计总对静效率要高于OFC的设计效率.为了对一维程序计算结果与三维CFD(computational fluid dynamics)数值模拟进行比较,选取已发表文献中600kW燃气轮机作为分析实例,用编写的一维热力设计程序对600kW燃气轮机向心透平导叶和动叶进行了设计.一维程序计算结果与三维CFD数值模拟结果比较发现,两者的偏差小于10%.综上所述,使用的设计方法以及一维热力设计程序对于小型向心透平的初步设计是适用的.

A reasonable method of choosing speed ratio and degree of reaction for small radial turbines was described, and a one-dimensional design code OCC （one-dimensional computer code） was programmed by analyzing all kinds of restriction factors on the speed ra- tio and degree of reaction. The code OCC was used for the design of nozzle and rotor blade of a 600 kW simple cycle gas turbine taken from the literature. The OCC results were com- pared with the results of the design and analysis code OFC （one-dimensional computer FOR- TRAN code） in the literature. The results were in agreement, and the total static isentrop- ic efficiency of the radial turbine designed by OCC was larger than that designed by OFC. The comparison between the CFD （computational fluid dynamics） simulation resulted that and the OCC results for the radial turbine shows the discrepancies were lower than 10%. In conclusion, the present design method and the one-dimensional design program are appropri- ate to the preliminary design of micro radial turbines.