Construction and teaching application of the twin screw compressor performance test experimental platform
[Objective]Experimental teaching plays an important role in the process fluid machinery course.It not only serves as an extension and application of theoretical knowledge but also stands as a pivotal avenue for fostering comprehensive student development.To improve the sophistication,innovation,and challenge within experimental teaching,an experimental platform has been designed and developed.This experimental platform conducts performance tests on twin screw compressors,facilitating routine experiments,such as working performance tests and p-V diagram drawing,and advanced research experiments,such as how adjustments in working conditions affect performance characteristics and verifying the efficacy of optimized designs for meshing pair profiles.[Methods]The experimental platform comprises gas and oil systems,a measurement and control system,and a regulating device.The gas oil systems are crucial in ensuring the stable operation of the platform.The experimental platform encompasses hardware implementation and software design crafted to meet the open exploratory requirements.For hardware,a twin screw compressor with a slide valve regulator is selected.The unloading valves are set up in the compressor pipeline to allow for various gas volume adjustments to complete the gas volume adjustments,ranging from 10%to 100%load.In addition,a removable torque sensor is installed between the motor and the compressor,empowering students to replace the meshing pair with an innovative design profile to carry out comparative performance experiments.Considering the profile characteristics of the meshing pair and the motion trajectory of the spiral groove,a strategic layout scheme has been devised for sensor placement.This setup aims to test the thermal performance parameters within the working chamber of the twin screw compressor.The selection of a data acquisition card,as well as pressure and temperature sensors,ensures the accuracy and reliability of the experimental data.On the software front,the platform utilizes virtual instrument software LabVIEW to develop a data acquisition system that boasts capabilities for real-time data acquisition,storage,processing,and graphical display functions,facilitating seamless communication between the system software and the hardware.[Results]It provides a convenient experimental operation interface,enabling the completion of various tasks,including testing,acquiring,and storing basic working performance parameters,such as exhaust pressure,temperature,flow rate,and P-V diagram drawing and efficiency analysis under variable load conditions.[Conclusions]The deployment of this working performance test experimental platform in the course's experimental teaching significantly enhances students'understanding of experimental principles.It enriches the course's experimental content with innovative and exploratory elements,enhancing student participation.This,in turn,should stimulate students'learning interests and foster a spirit of independent exploration and practice.The platform provides a strong foundation for cultivating students'engineering practice abilities and independent innovation skills.Ultimately,it can also help advance the development of the first-class course"Process Fluid Machinery"and better adapt to the construction requirements of"Emerging Engineering"and"Excellence Program 2.0."
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