Effects of Mach Number and Magnetic Fields on Performance of MHDG in Nozzle

Li  Hao; Huang  Hulin; Zhu  Guiping; Zhang  An

doi:10.6180/jase.202509_28(9).0008

Effects of Mach Number and Magnetic Fields on Performance of MHDG in Nozzle

Li Hao¹, Huang Hulin¹This email address is being protected from spambots. You need JavaScript enabled to view it., Zhu Guiping¹, and Zhang An²

¹Laboratory of Aerospace Entry, Descent and Landing Technology, College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

²College of Mechanical and Electrical Engineering mechanical engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received: September 21, 2024
Accepted: November 13, 2024
Publication Date: December 11, 2024

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202509_28(9).0008

The technique of magnetohydrodynamic (MHD) power generation has attracted a lot of interest as a potential means of improving the effectiveness and performance of hypersonic vehicle. Therefore, in current research the flow characteristics of the hypersonic vehicle nozzle with a magnetohydrodynamic generator (MHDG) at different incoming Mach numbers were analyzed to understand the effect of different parameters on the performance. The results showed that when the entrance incoming Mach number was below 1.1, the thermal choking effect occurred at the entrance of nozzle, so that reduction in the real Mach number is required to a certain value before the weakly ionized gas (WIG) entered the nozzle. As the value of entrance incoming Machnumberapproaches to 1.1, the thermal choking effect was strengthened at the nozzle entrance and the entrance real Mach number was descended, the power generation efficiency and the enthalpy extraction rate were declined. On the contrary, as value of entrance incoming Mach number exceeded 3, the entrance real Mach number became equal to the entrance incoming Mach number due to the absence of thermal choking, the power generation efficiency remained unaffected with the rise of the entrance incoming Mach number. Additionally, the power generation efficiency decreased as the magnetic field increased when the entrance incoming Mach number was set to 1.1, however, when the entrance incoming Mach number was set to 3, the effect of the magnetic field on the power generation efficiency vanished, and the power generation efficiency remained constant as the magnetic field increased.

Keywords: MHDG;Entrance incoming Mach number; Magnetic field; Power generation efficiency; Enthalpy extraction rate

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