Prototyping and Study of Jet Systems for Developing Mesh Turbomachines

Abstract

This paper presents a research aimed at developing energy-efficient turbomachines for complicated operating conditions at high gas temperature, high gas, or gas-liquid flow rate, or in the presence of solid abrasive particles in the flow. In the paper, the authors propose to consider possibilities for developing hybrid turbomachines with both jet device and impeller machine properties. The research has been carried out at the junction of two scientific and technical directions. The first one is associated with the field of mesh turbomachinery, while the second direction is associated with the field of jet control systems that enable to control the velocity vector (thrust vector). The software package FlowSimulation (FloEFD) has been used for computer simulation and computational research. The 3D model has been created using the SolidWorks CAD system. Examples show that using a curved mixing chamber, the ejector allows for an energy conversion process similar to the working process in an impeller machine. During the main working time, the gas jet is directed along a curved pipe that serves as a mixing chamber. The hypothesis about the possibility of creating a torque on the turbomachine shaft due to a pulsed reverse flow in the mixing chamber of the ejector located in the turbine rotor cavity has been tested. Based on the results of the computer simulation, conclusions about the prospects of hybrid turbomachines are drawn. Prototypes (micromodels) of the turbine have been developed by using additive technologies. Pneumatic and hydraulic tests of the micromodels confirmed the operability of the proposed technical solution. One of the development directions may be associated with the Euler turbine modernization. It is concluded that the scientific and technical potential of the Euler turbine has not yet been fully disclosed, and research work in this direction should be continued. Findings are applicable in various industries, including energy economy, robotics, aviation, and water transport.