|
With the growing awareness of environmental issues , natural refrigerant CO2 with its environmentally friendly re-emergence of CO2 heat pump system has become a hot research . The researchers found that the CO2 transcritical the circulatory system introduced ejector instead of throttle pressure energy recovery of part of the expansion process , not only solve the problem of large throttling losses , improve the suction pressure of the compressor , saving compressor the input power , and the heat exchanger fluid is more evenly distributed , reducing the pressure drop of the evaporator , the heat transfer coefficient of the evaporator is increased . On this basis , the paper proposes a novel adjustable injector program , i.e. is set within a fixed structure injector needle to adjust the injector geometry parameters , and around the CO2 heat pump water heater of an adjustable injector to carry out research , main content are as follows : 1 , ejector works thermodynamic analysis, written adjustable injector design software , and complete adjustable injector design ; 2 , experimental design , adjust the needle to study the geometry and operating parameters of the injector impact on the performance of the ejector , and the results were analyzed and summarized ; 3 , on the basis of in-depth study on the flow and mixing ejector mechanism , combined with the experimental results , the establishment of two - dimensional numerical simulation model of the injector ; 4 , completed can modulation injector numerical simulation, and its internal pressure , speed , and temperature distribution, and to analyze and summarize the simulation results .
|