In the context of propulsion technology, what is the primary difference between deflagration and detonation?

Deflagration involves subsonic combustion, while detonation involves supersonic combustion.

Deflagration occurs at constant volume, while detonation occurs at constant pressure.

Deflagration requires higher pressure than detonation to initiate combustion.

Deflagration involves supersonic combustion, while detonation involves subsonic combustion.

Which of the following best describes the combustion process in a Rotating Detonation Engine (RDE)?

Combustion happens at constant volume within an annular chamber.

Combustion happens at constant pressure in a long linear tube.

Combustion products are expelled at lower speeds than conventional engines.

Combustion is triggered by a spark plug at subsonic speeds.

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18 August 2026

Rotating detonation engines technology

Rotating Detonation Engine technology represents a significant advancement in aerospace propulsion with direct implications for India's space and defense indigenization efforts, making it a relevant topic for GS3 science and technology questions.

Notes

Rotating Detonation Engine (RDE) is an advanced propulsion design offering higher fuel efficiency compared to conventional rocket engines.
RDEs utilize detonation (supersonic combustion) rather than deflagration (subsonic combustion) to convert chemical energy into useful work.
Combustion in RDEs occurs at constant volume, whereas conventional engines operate at constant pressure.
Thermodynamic efficiency of RDEs is estimated to be 10% to 25% higher than conventional combustors, potentially reducing fuel requirements by approximately 17%.
Design mechanism: RDEs feature an annular combustion chamber where fuel and oxidizer are injected continuously, allowing detonation waves to circulate in a ring.
Technical challenges: Sustaining detonation requires precise control of fuel injection, internal pressure, and specific chamber geometry.
Operational requirements: Materials must withstand temperatures exceeding 2,000° C, pressures of 10-100 atmospheres, and high-frequency oscillations.
Current status: RDE technology is in the R&D phase with no commercial or military models currently deployed.
Recent developments: Indian start-up D-Propulse demonstrated an RDE at a DRDO facility; global entities like GE Aerospace, Lockheed Martin, and others are actively testing RDEs for missiles and spacecraft.

Questions

Explain the working principle of a Rotating Detonation Engine (RDE) and discuss how it achieves higher thermodynamic efficiency compared to conventional rocket engines. 150 words

Attempt this — 150 words in 8 min

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Analyze the potential of Rotating Detonation Engine (RDE) technology in transforming aerospace propulsion. What are the primary engineering challenges that must be addressed to transition this technology from research to operational deployment? 250 words

Attempt this — 250 words in 11 min

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Prelims

In the context of propulsion technology, what is the primary difference between deflagration and detonation?

Which of the following best describes the combustion process in a Rotating Detonation Engine (RDE)?

Syllabus

Topics

Sources

Rotating detonation engines: the science and the promises

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