System Math Design And Structure Optimization Design Of A Vapor Cycle Cooling System For A Helicopter

It started late on the research for a vapor cycle system in China. It’s not a mature technology for the vapor cycle cooling system. Based on the Graduate Student Innovation Fund, with the aid of advanced refrigeration technology at home and abroad, this paper focuses on research and development of the vapor cycle cooling system of the helicopter. Using modular design, install independent vapor cycle cooling system. In addition to the power supply, not connected to other systems of the helicopter, in case of failure the system does not affect the normal flight of helicopter. Modular management improves reliability of system. It’s easy to install, test failure and rapid change of maintenance in helicopter.This paper mainly studies content:(1) Based on the design parameters of the vapor cycle cooling system, the match design is carried out. Determine the operation condition and thermodynamic cycle pressureenthalpy chart, and carry on the thermodynamic calculation, and the main performance parameters, the required refrigerating capacity is achieved, which provides a basis for the match design in the actual system.(2) Compressor, evaporator, condenser, expansion valve are rationally arranged on the structure. The mechanical structure is designed to ensure that they have good carrying capacity and aerodynamic. Two kinds of different shapes of evaporation circulating cooling system are designed. Based on CFX, CFD of the system shapes was carried out. The speed flow field distribution and surface pressure distribution are simulated to get air flow pattern of the surface. It verifies that the second shape has better aerodynamic properties.(3) Based on multi-objective optimization design module of ANSYS Workbench, the sensitivity of the dimensional parameters of the structure is analyzed to get the main parameters which influence the stress, strain and quality of the structure. The optimization design is carried out by the method of using multi-objective genetic algorithm, to get structure parameters of the design requirements. Finally, the structural dynamics analysis and fatigue strength calculation are carried out to verify whether the structure optimized can withstand the vibration of the helicopter or not.