An adjustable multi-fuel jet high-altitude ignition device for a rotary engine

By designing an adjustable multi-fuel jet high-altitude ignition device, the high-temperature jet in the pre-combustion chamber is used to ignite the gas mixture, solving the problems of low combustion efficiency and ignition difficulty of rotary engines at high altitudes, improving combustion efficiency and power performance, and reducing emissions.

CN119308755BActive Publication Date: 2026-07-17AIR FORCE UNIV PLA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
AIR FORCE UNIV PLA
Filing Date
2024-10-16
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Rotary engines experience reduced combustion thermal efficiency, increased fuel costs, and ignition difficulties at high altitudes, which negatively impacts the maneuverability of unmanned aerial vehicles (UAVs). There is limited research on existing multi-fuel blending and controlled combustion strategies and jet ignition technologies.

Method used

Design an adjustable multi-fuel jet high-altitude ignition device for a rotary engine. The device measures the cylinder pressure using a cylinder pressure sensor, adjusts the auxiliary fuel injection quantity and the number of jet holes, and ignites the air-fuel mixture using a high-temperature jet in the pre-combustion chamber, achieving efficient combustion under low pressure.

Benefits of technology

It improves the combustion efficiency and power performance of the rotary engine at high altitudes, reduces emissions, and improves the ignition boundary and combustion stability.

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Abstract

This invention discloses an adjustable multi-fuel jet high-altitude ignition device for a rotary engine, comprising a jet ignition device, an adjustment device, a rotary engine body, a fuel injection system, and a control system. One end of the jet ignition device is mounted on the cylinder block of the rotary engine body, and the other end is connected to the adjustment device. The fuel injection system is installed in the intake manifold of the rotary engine body and the jet ignition device, used for premixing aviation kerosene intake air and direct injection of gasoline into the cylinder. The control system is connected to the spark plug of the jet ignition device and the end of the fuel injection system, and also controls the adjustment device via a drive motor, thereby adjusting the deflection angle of the combustion chamber liner in the rotary engine body. This invention proposes an active pre-combustion chamber structure for the engine. By measuring the cylinder pressure at different altitudes using a cylinder pressure sensor and adjusting the auxiliary fuel injection quantity and the number of jet orifices, the high-temperature jet from the pre-combustion chamber ignites the premixed mixture in the main combustion chamber, achieving efficient and complete combustion of aviation kerosene and gasoline mixture under low-pressure conditions, providing high-altitude engine power performance and reducing emissions.
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