| In recent years,with the development and maturity of gas turbine technology,gas turbine plays a more and more important role in its related fields,and is the focus of research and development in China.Intercooled recuperated cycle gas turbine is a complex cycle gas turbine with outstanding advantages.The heat exchanger and size heat transfer efficiency are required very high in intercooler.In order to improve the efficiency of gas turbine,the choice of heat exchange fluid in intercooler becomes more and more important.As a new heat exchange fluid,nanofluids show great potential in the field of heat transfer enhancement.Taking the WR-21 gas turbine as an example,the FLUENT software is used to simulate ethylene glycol aqueous solution,water,four different concentrations of copper oxide-ethylene glycol nanofluid,five different concentrations of Cu-water nanofluids and five different concentrations of Al2O3-water nanofluids as cooling media work in the intercooler under 40%,60%,80%,100%load of gas turbine.The simulation results were summarized and analyzed.When the gas turbine is under high load,the nanofluid exhibits a good heat transfer effect,and at low load,the heat transfer enhancement effect is not obvious.The gas side outlet temperature decreases as the concentration of the nanofluid increases.Under the same load of gas turbine,the heat exchange amount and the liquid side outlet temperature increase with the increase of the concentration of the nanofluid.When the nanofluid is used as the cooling medium,the liquid side pressure loss increases slightly,and the pressure loss is proportional to the nanofluid concentration.The heat exchange capacity of Cu-water or Al2O3-water nanofluids is much higher than that of water under different loads of gas turbine.Under the same load,the heat exchange capacity of CuO-ethylene glycol nanofluids higher than that of ethylene glycol aqueous solution is relatively smaller.Considering all factors,when CuO-ethylene glycol nanofluid is used as the cooling medium,the concentration of 0.5%is the best.When Cu-water or Al2O3-water nanofluid is used as the cooling medium,the concentration of 3%is the best.The use of water-based nanofluids is more beneficial than the base fluid.The research contents and conclusions in this paper provide theoretical support for the application of nanofluids in intercooled recuperated cycle gas turbine,guide engineering practice,and provide some ideas for the application of nanofluids in different occasions to enhance heat transfer. |
