Combined power system and multimodal operation method based on liquid zero-carbon fuel

By introducing a combination of regenerative cooling channels and pre-combustion chambers into the combined power system, and utilizing the cooling path and cracking strategy of liquid ammonia, the problems of combustion instability and system complexity were solved, achieving efficient and stable combustion of liquid ammonia fuel over a wide speed range, simplifying system design and improving engine performance.

CN121738783BActive Publication Date: 2026-05-26NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Filing Date
2026-02-28
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing combined power systems suffer from problems such as unstable combustion, high system complexity, high safety risks, high cost, and poor adaptability when using hydrocarbon fuels, liquid hydrogen, and liquid ammonia fuels. In particular, fuel supply matching is difficult under multi-mode conditions, making it difficult to achieve efficient and stable combustion.

Method used

Using a regenerative cooling channel and a pre-combustion chamber as key regulating units, and through the cooling path and cracking strategy of liquid ammonia, efficient thermal management and stable combustion of single liquid ammonia fuel are achieved in a wide speed range. Waste heat is absorbed in the regenerative cooling channel for catalytic cracking to produce hydrogen-rich gas, which is then actively cracked in the pre-combustion chamber to provide a controllable hydrogen source replenishment.

Benefits of technology

It achieves stable and efficient combustion under all operating conditions from low speed to high speed, eliminates dependence on independent hydrogen storage systems, simplifies system structure, reduces technical risks and costs, and improves engine adaptability and performance.

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Abstract

This invention discloses a combined propulsion system and multi-modal operation method based on liquid zero-carbon fuel. The combined propulsion system includes a first propulsion assembly, a second propulsion assembly, a pre-combustion chamber, a liquid ammonia storage tank, and an oxidizer storage tank. The first propulsion assembly includes an air intake channel, an isolation section, a first thrust chamber, and a first nozzle connected in sequence. The second propulsion assembly includes a second thrust chamber and a second nozzle connected in sequence. The liquid ammonia storage tank is connected to the first thrust chamber and the pre-combustion chamber via a fuel supply channel assembly. The oxidizer storage tank is connected to the second thrust chamber and the pre-combustion chamber via an oxidizer supply channel assembly. The pre-combustion chamber is connected to the first thrust chamber and the second thrust chamber via a gas supply channel assembly. This invention is applied in the field of combined propulsion and can intelligently adjust the cooling path and cracking strategy of liquid ammonia according to different operating modes, achieving efficient thermal management and stable combustion of a single liquid ammonia fuel in a wide-speed range of flight.
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Citation Information

Patent Citations

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