Jiangsu Haifa Machinery Manufacturing Co., Ltd.

With the rapid development of commercial aerospace and reusable rocket technology, liquid oxygen methane engines are gradually becoming a key direction for next-generation rocket propulsion systems due to their high specific impulse, low carbon deposition, and excellent reignition performance. As the core equipment of the propellant delivery system, the performance and reliability of the liquid oxygen methane pump directly affect the stable operation and flight safety of the rocket engine.

The liquid oxygen methane pump is a high-speed cryogenic centrifugal pump that must operate stably over long periods under extremely low temperatures, high pressure differentials, and complex, variable working conditions. Due to the low-temperature and easily vaporizable nature of liquid oxygen and liquid methane, the pump is prone to issues such as cavitation, vibration, seal failure, and thermal stress deformation during operation, imposing stringent requirements on its hydraulic design, structural strength, and material performance.

To address the complex operating conditions of rockets, a dual cryogenic centrifugal pump and a coaxial high-temperature turbopump are employed. The liquid oxygen methane centrifugal pump typically adopts a high-efficiency three-dimensional flow impeller design and a low-cavitation inducer structure. By optimizing the flow path and pressure distribution, the pump's resistance to cavitation under low inlet pressure conditions is enhanced. Meanwhile, the use of lightweight, high-strength alloy materials and cryogenic sealing technology effectively reduces the risks of thermal deformation and leakage, ensuring stable propellant supply during engine startup, variable-condition regulation, and reignition processes.

Furthermore, to meet the demands for rapid response and high reliability in rockets, the liquid oxygen methane pump extensively incorporates high-speed bearings, dynamic balance control, and intelligent monitoring technologies. These enable real-time monitoring of vibration, temperature, and pressure parameters, thereby improving system operational safety and service life. In the future, with the continued development of high-thrust liquid oxygen methane engines, key technologies for high-performance cryogenic centrifugal pumps will further drive China's commercial aerospace, reusable rockets, and deep-space exploration equipment toward higher efficiency and greater reliability.