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With the advent of the21st century, people have a sense of crisis for the lack of non-renewable resources, increasing pollution, wich influenced people’s living environment. Therefore, the development and research of compressed air-powered vehicle has been a breakthrough solution. Air-powered vehicle uses high-pressure compressed air as the driving force, and the internal energy of the compressed air output as mechanical kinetic energy to do work, so the air-powered vehicle is a zero-energy consumption and zero-emissions clean-type vehicle. This kind of vehicle can use wind, solar and other new energy as a power source, to fully achieve the energy saving requirements.This topic, first introduced a new type of air-powered automobile engine, scroll expander. Scroll expander is a low-temperature waste heat recovery system, can be used as a key component, is also a zero energy consumption, zero emission power engine, with high reliability, efficient whims, low vibration, compact structure, excellent performance, and thus in recent years, more and more domestic and foreign research scholars have pay attention to scroll expander.First, with the base of a scroll machine, analyze the mechanical structure of the scroll-type expansion machine from the geometrical theory. Then, set up an experimental bench for the scroll expander. Air compressors, high pressure air tank, pressure reducing valves, air-powered flow control valve, vortex flowmeters, temperature and pressure sensors, high-pressure pipeline, dynamometer, connect these hardwares to build this experimental bench for testing a scroll expander. And use the Advantech ADAM-4000Series data acquisition card sensor, so the flowmeter measured data can be transmitted to the host computer system, this system can make signal processing and uploading. After all, write a data acquisition virtual instrument control panel with LabVIEWAfter building this experimental test bench, under a certain opening degree of the air-powered flow control valve, changing the load and speed of the scroll-type expansion machine, and the test the scroll expander repeatedly. Get the data, draw targets that show the speed characteristics of scroll expander. In these targets, with the growth of the working speed, speed characteristics show a trend towards an improvement. Analysis of the appropriate circumstances in the flow rate adjusting valve opening degree, the scroll-type expansion machine at high speed under leak alleviated, the effective thermal efficiency is also improved. Therefore reduce the scroll expander can be drawn leakage is an important measure to improve the scroll expander acting performance.Finally, the theoretical analysis of air-powered vehicles traveling speed and distance traveled, the establishment of a the pneumatic vehicle power system design. Lay a theoretical foundation for the follow-up phase of the experiment.
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