Development Of STM32 High Frequency Ring Heat Engine

Fluid flow rate is a critical physical parameter content to describe the flow field, measurement and analysis of fluid flow is extremely important to study its hydrodynamic and physical properties. As an important way to test fluid flow rate, this paper carried out the research of hot-wire anemometer to measure wind speed. It provided a solution to measure and research the characteristic of wind.According to the principle of constant-temperature hot-wire anemometer, a model of constant-temperature control circuit was applied to keep the resistance of hot-wire constantly in this paper. First, it analyzed the static and dynamic operating characteristics of this model, and it studied some dynamic factors which could the affect dynamic operating characteristics. The main factors were obtained including overheat ratio of hot-wire probe, Wheatstone bridge arm resistance bridge, amplifier gain compensation inductors, velocity of flow field and bias voltage.Combined with MATLAB simulation, results were obtained that the increase of overheat ratio of hot-wire probe, reduce the Wheatstone bridge arm resistance, which can improve the dynamic characteristic of the whole system. The dynamic characteristics of the system can be optimized by adjusting the inductance of the compensated reasonably. When the influent factors was set unreasonable, it would reduce the dynamic characteristics of the system, even lead to system oscillations and it cannot work properly. The reasonable adjustment of the bias voltage can reduce and eliminate the oscillation, and the system can reach a stable statement. At the same time it could obtain a good dynamic characteristic.According to the results of the simulation analysis, optimization of circuit parameters in the system was carried out which contained of bridge circuit, signal amplifying circuit, filter circuit and power amplifying circuit, and it made some anti-jamming processing. At the same time, the design of the data acquisition and transmission system based on STM32 to do the data acquisition and communication task. And the host computer programming by LABVIEW language would receive the data analysis. The correctness of the theoretical simulation results is verified by the experimental results. Through the experiments it verified that the theoretical simulation results were correct. The experimental results showed that the system had ten-kHz dynamic response ability; fulfilled the requirements of system design.