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Big thrust debut! JiuZhouYunjian "Longyun" liquid oxygen methane engine completes semi-system hot test run assessment!

(Summary description)Recently, JiuZhou Yunjian’s next-generation high-thrust liquid oxygen methane engine Longyun completed a semi-system hot test run. During the test run, the turbo pump speed, post-pump pressure, gas generator chamber pressure, temperature, ignition system pressure and other parameters were stable throughout. Consistent with the preset value.

Big thrust debut! JiuZhouYunjian "Longyun" liquid oxygen methane engine completes semi-system hot test run assessment!

(Summary description)Recently, JiuZhou Yunjian’s next-generation high-thrust liquid oxygen methane engine Longyun completed a semi-system hot test run. During the test run, the turbo pump speed, post-pump pressure, gas generator chamber pressure, temperature, ignition system pressure and other parameters were stable throughout. Consistent with the preset value.

  • Categories:Company News
  • Time of issue:2021-04-02 08:03
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Recently, JiuZhou Yunjian’s next-generation high-thrust liquid oxygen methane engine Longyun completed a semi-system hot test run. During the test run, the turbo pump speed, post-pump pressure, gas generator chamber pressure, temperature, ignition system pressure and other parameters were stable throughout. Consistent with the preset value.
The successful hot test of Longyun engine semi-system marked:
1. It is the first domestic breakthrough in the technology of turbopump gas cylinder spin + flare-type electric ignition to start high-thrust liquid oxygen methane engine technology, and preliminary verification of multiple start-up capabilities;
2. For the first time in China, the multi-condition and semi-system hot test was realized, and the Longyun engine's deep variable thrust work adaptability was evaluated in advance on the semi-system;
3. Longyun engine is about to usher in the hot test of the whole system this year.

Longyun semi-system hot test video
What is a semi-system?
Semi-system refers to the secondary circuit system + main circuit valve of the open-cycle liquid rocket engine. The secondary circuit system mainly includes the ignition system, gas generator, turbo pump, secondary control valve, relief valve, solenoid valve, and one-way valve. The main circuit valve mainly includes the main valve and throttling components. The semi-system is the most complex and important part of the open-cycle liquid rocket engine. It is responsible for important missions such as energy conversion, propellant delivery, and thrust adjustment. Whether the engine can be started and shut down smoothly depends on whether the components in the semi-system can be matched well.

Longyun engine semi-system hot test screen
What is the semi-system test?
The semi-system test mainly assesses the rationality and working compatibility of the gas generator and turbo pump, the core component of the liquid rocket engine, the start-up and shutdown characteristics of the engine, and obtains the necessary parameters for the full-system work. After the semi-system test is completed, the distance between the engine and the turbopump is full. The systematic "big test" is only one step away.
Kyushu Yunjian Engine Technical Officer said:
The most important point of this round of Longyun engine semi-system test is to use real propellant to assess the tacit degree of cooperation between the gas generator and the turbopump in advance, and to predict the working status of the engine's entire system, start-up and shutdown characteristics, timing formulation, and variable thrust assessment The plan lays the foundation, especially for the pump rear swing engine. The successful semi-system test of this real propellant indicates that the Longyun engine has succeeded more than 70%.

Longyun engine mould assembly drawing
Longyun engine profile:
The Longyun engine is an 80-ton liquid oxygen methane engine. It is the second-generation liquid oxygen methane engine product developed by Kyushu Yunjian. It is also the first domestic high-thrust engine with no pyrotechnic device. The use conditions are friendly. This engine has better performance. With high thrust-to-weight ratio, it can achieve a configuration layout of five units with a diameter of 3.35m, with a 30%-110% deep thrust adjustment capability, and can achieve multiple starts. It is suitable for the retrievable ground-level or second-level of medium and large rockets.

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