In this paper, the vortex throttle model and the conventional throttle model were established and compared. Both the throttles' air flow within the model were simulated. Air flow velocity and flow were compared. The results show that, through the forming of a swirling motion of the air, the vortex throttle's air flow velocity and flow rate were increased at each same degree of valve opening. The vortex throttle's turbulent kinetic energy also helps the entry of air, thereby increasing the amount of air entering the engine. On this basis, engine performance tests were carried out on two engines installed with each type of throttle. Performance test results show that, under the same power and torque output, the economy of the engine was enhanced by the vortex throttle. The results of simulation analysis and performance tests show that the vortex throttle created a swirling motion, which increases the amount of intake air to improve engine performance.

Biogas is an environmentally friendly and clean, pollution-free fuel. In this paper, biogas generators have been researched in order to study the use of pig farm biogas in China. First, the pig farm biogas components are grouped, tested, and formulated. Since the biogas combustion process is not the same as for gasoline, biogas processing is carried out in a constant volume bomb combustion test, thus, the different components of biogas combustion speed, combustion pressure, and other information become available. The biogas combustion process in the combustion chamber and movement are simulated, and the cylinder pressure, speed, and temperature conditions are obtained. As can be seen from the experimental results, the biogas combustion speed is lower than that of gasoline, the ignition timing generator needs to be adjusted. In order to reduce the possibility of post-combustion occurring in the combustion chamber, certain combustion chamber swirl movements should be organized. The results show that by adjusting the ignition timing, air movement, and other factors, biogas can be used as fuel in generators.