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By:

Commodore S.L. Deshmukh

31 October 2024 at 8:30:19 am

The Detonation Race Is On

Rotating detonation engines could redefine propulsion in the near future, and India cannot afford to be a bystander For more than a century, the basic architecture of the jet and rocket engine has remained remarkably resilient. Fuel is burned, gases expand and turbines, compressors or other components turn that energy into thrust. Now, a different idea is beginning to move from laboratories towards operational propulsion: the rotating detonation engine (RDE). It replaces conventional...

The Detonation Race Is On

Rotating detonation engines could redefine propulsion in the near future, and India cannot afford to be a bystander For more than a century, the basic architecture of the jet and rocket engine has remained remarkably resilient. Fuel is burned, gases expand and turbines, compressors or other components turn that energy into thrust. Now, a different idea is beginning to move from laboratories towards operational propulsion: the rotating detonation engine (RDE). It replaces conventional combustion with a continuously travelling supersonic detonation wave, promising greater efficiency in a smaller and mechanically simpler package. If propulsion is a contest between how much energy can be extracted from fuel and how little machinery is required to do it, RDEs have an intriguing advantage. An RDE works inside an annular, or ring-shaped, combustion chamber. Fuel and oxidiser are injected into the chamber and ignited. Instead of a conventional flame moving relatively slowly through the mixture, a detonation wave races around the chamber at supersonic speed. The wave compresses and ignites fresh fuel as it travels, creating a self-sustaining cycle. The resulting high-temperature gases are expelled axially, generating continuous thrust. Improving Fuel Efficiency That is fundamentally different from the combustion process used by traditional engines. Conventional gas-turbine engines operating on the Brayton cycle rely on subsonic deflagration - a rapid burning process in which the flame front travels through the combustible mixture at less than the speed of sound. RDEs generally operate on the Humphrey cycle, using pressure-gain combustion to extract more useful energy from the chemical reaction before the gases are expelled. Detonation-based combustion has the potential to improve fuel efficiency by as much as 25 percent compared with conventional engines. RDEs can also dispense with some of the heavy and complicated moving machinery associated with traditional propulsion systems. That creates the possibility of engines that are smaller, lighter and easier to manufacture. For missiles and rockets, where every kilogram matters, such advantages are particularly valuable. The appeal extends beyond efficiency. A continuously propagating detonation wave can provide steady thrust while eliminating the need for a conventional turbine-compressor architecture. The result could be a propulsion system suited to hypersonic missiles, high-speed aircraft, space vehicles and other platforms where compactness and performance matter as much as raw power. That said, maintaining a smooth and stable detonation wave is extraordinarily demanding. Fuel injection must be precisely controlled and the geometry of the combustion chamber carefully engineered. The number, spacing and shape of injectors can determine whether the detonation remains stable or breaks down. Inside the chamber, extreme temperatures and pressures place enormous demands on engine walls, requiring advanced cooling systems and high-performance materials. These engineering problems explain why the RDE revolution has been promising for years without yet becoming routine technology. The challenge is no longer simply demonstrating that a detonation can be sustained. It is turning that phenomenon into a reliable, durable and flight-ready propulsion system. Production Race The United States is pushing ahead on several fronts. NASA has successfully tested full-scale RDEs producing more than 5,800 pounds of thrust and is planning to raise that figure to 10,000 pounds for potential lunar and Mars missions. Pratt & Whitney, part of RTX, has conducted extensive RDE testing for military applications, exploring high-speed and long-range propulsion with a simpler architecture. DARPA is pursuing RDE technology for hypersonic standoff missiles under its Gambit programme, while L3Harris has conducted long-duration, full-scale tests aimed at advancing next-generation missile propulsion. The international competition is broader still. Japan’s JAXA, GE Aerospace and Chinese institutions have been pursuing RDE applications in rockets and hybrid air-breathing engines, including systems intended for hypersonic flight. China, in particular, is treating the technology as part of its broader push towards high-speed aerospace and military systems. Researchers at Tsinghua University introduced a hybrid design in 2024 combining a ramjet with a rotating rotor compressor, intended to improve starting at lower speeds and enhance performance during flight. In 2025, scientists at the Beijing Power Machinery Research Institute reportedly completed a milestone test of an RDE operating steadily for 180 seconds at Mach 6.3. Recent Chinese test engines have also reportedly incorporated specialised materials capable of tolerating internal temperatures of up to 2,500°C. For India, therefore, RDEs are no longer merely an interesting engineering experiment but are fast becoming part of the strategic propulsion race. India has already taken an important step. Defence propulsion start-up D-Propulse, incubated at IIT Madras, has demonstrated what it describes as the country’s first indigenous 5 kN air-breathing RDE coupled with an aerospike nozzle. The hot-fire demonstration was conducted at a DRDO test facility and reportedly achieved Technology Readiness Level-5 validation in the specified environment. That matters because it represents a movement from laboratory research towards an integrated propulsion prototype. D-Propulse has stated that it is targeting a flight-ready engine by December 2027. The company says its technology can deliver 15–25 percent higher thermodynamic efficiency than conventional air-breathing propulsion systems and can be produced through precision machining rather than complex turbine assemblies, potentially reducing both production costs and lead times. The applications could be considerable. Defence systems could include hypersonic missiles, air-to-air and air-to-ground weapons and compact propulsion systems for standoff strike platforms. In space, RDEs could find uses in upper-stage rocket engines, planetary landers and deep-space propulsion, where higher efficiency and lower engine mass are particularly valuable. The technology could even migrate beyond aerospace: RDE-based gas turbines could potentially generate electricity with greater thermal efficiency and lower fuel consumption. The larger significance is that propulsion technology often determines what a country can build, how far it can travel and how quickly it can respond. RDEs remain an emerging technology, and their promise should not be confused with operational maturity. But countries that solve the problems of stability, materials, cooling and reliable fuel injection first could gain an important advantage in the next generation of aerospace and defence systems. (The writer is a retired naval aviation officer and a defence and geopolitical analyst. Views personal.)

India working on logistics of Tahawwur Rana's extradition

  • PTI
  • Feb 14, 2025
  • 3 min read

Updated: Feb 18, 2025

Tahawwur Rana

Washington: India is working on the logistics of Tahawwur Rana's surrender and extradition from the US, Foreign Secretary Vikram Misri has said, as President Donald Trump announced that his administration has given the go-ahead to extradite the 26/11 terror attack accused “to face justice".

“This is an issue on which the US authorities have taken very clear decisions. I think you've seen the President announce it himself from the White House podium" the decision of the US to extradite Rana, Misri said at a press conference here on Thursday.


During a joint press conference with Prime Minister Narendra Modi in the White House, US President Donald Trump announced that his administration has approved the extradition of "very evil" Tahawwur Rana, wanted by Indian law enforcement agencies for his role in the 26/11 Mumbai terror attacks, "to face justice in India”.


In response to a question by PTI on the timeframe by when Rana will be extradited to India, Misri said: "We are working on the logistics of his surrender and extradition to India. There are a few final steps to be completed. The two sides are in touch on this particular issue.”


The India-US joint statement issued during the Prime Minister's visit to the US notes that Modi and Trump reaffirmed that the global scourge of terrorism must be fought and terrorist safe havens eliminated from every corner of the world.

“They committed to strengthen cooperation against terrorist threats from groups, including Al-Qaeda, ISIS, Jaish-e Mohammad, and Lashkar-e-Tayyiba in order to prevent heinous acts like the attacks in Mumbai on 26/11 and the Abbey Gate bombing in Afghanistan on August 26, 2021," the joint statement said.


“Recognising a shared desire to bring to justice those who would harm our citizens, the US announced that the extradition to India of Tahawwur Rana has been approved," it said.


The leaders further called on Pakistan to expeditiously bring to justice the perpetrators of the 26/11 Mumbai, and Pathankot attacks and ensure that its territory is not used to carry out cross-border terrorist attacks.

"The leaders also pledged to work together to prevent the proliferation of weapons of mass destruction and their delivery systems and to deny access to such weapons by terrorists and non-state actors,” the joint statement added.

Rana, a Canadian national of Pakistani origin, is currently lodged at a metropolitan detention centre in Los Angeles. He is known to be associated with Pakistani-American terrorist David Coleman Headley, one of the main conspirators of the 26/11 attacks.

Speaking at the joint press meet, Trump said "Today I am pleased to announce that my administration has approved the extradition of one of the plotters and very evil people of the world, and having to do with the horrific Mumbai terrorist attack, to face justice in India. So, he is going back to India to face justice."


The extradition of Rana was cleared by the US Supreme Court in January as it rejected his review petition in the case.


India last month said it was working with American authorities for the early extradition of Rana.


"The US Supreme Court on January 21 declined to hear a petition from the accused. We are now working with the US side on procedural issues for early extradition to India of the accused in the Mumbai terror attack," External Affairs Ministry spokesperson Randhir Jaiswal had said.


In November 2012, Ajmal Amir Kasab, the lone surviving gunman among the Pakistani group, was hanged to death in Yerawada Jail in Pune.

-PTI

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