Temperature control and simulation of helicopter's sand/dust environmental test tunnel

The change range of heat load in helicopter's sand/dust test tunnel is so wide that different heat balance devices are needed for high and low heat loads, and that the temperature control is difficult. In order to solve the temperature control problem more simply, a temperature control strategy with wind speed corresponding factor is presented based on the dynamic analysis and modeling of tunnel's temperature change. Simulation results show that this control strategy can manage the cooling and heating devices on different load conditions and temperature in tunnel is controlled at demand point successfully.