ISRO conducts sea level test of CE20 cryogenic engine

Why in the News

• The Indian Space Research Organisation (ISRO) successfully conducted a sea-level hot test of the CE20 cryogenic engine on March 10 at the ISRO Propulsion Complex.
• The test demonstrated higher thrust capability, which could enhance the payload capacity of India’s heavy-lift rocket, LVM3.

Key Highlights

• The CE20 cryogenic engine operated for 165 seconds during the test.
• It generated around 22 tonnes of thrust at sea level.
• The engine powers the upper stage of the LVM3 rocket.
• It has also been human-rated for India’s first human spaceflight mission, Gaganyaan.
• The higher-thrust test aims to increase payload capacity for future satellite launches and deep-space missions.

What is a Cryogenic Rocket Engine?

• A cryogenic rocket engine uses liquid hydrogen (LH₂) and liquid oxygen (LOX) as propellants.
• These propellants are stored at extremely low temperatures:
  • Oxygen liquefies at −183°C
  • Hydrogen liquefies at −253°C

Advantages of Cryogenic Engines

• Higher efficiency:
  They provide greater thrust per kilogram of propellant compared to solid or earth-storable liquid fuels.
• High Specific Impulse:
  Cryogenic propellants deliver much higher specific impulse, improving payload capacity.
• Better performance for heavy missions:
  Essential for heavy satellites and deep-space missions.

Technical Challenges

• Cryogenic engines are highly complex systems due to:
  • Extremely low-temperature propellants
  • Thermal and structural stresses
  • Turbo pumps rotating at ~40,000 rpm
• Require sophisticated ground support systems, including:
  • Cryogenic propellant storage and filling systems
  • Special testing facilities
  • Safe transportation and handling of cryogenic fluids.

Significance

• Enhances the performance and payload capacity of LVM3, India’s most powerful rocket.
• Strengthens India’s capabilities for heavy satellite launches and interplanetary missions.
• Supports the success of the Gaganyaan human spaceflight programme.
• Demonstrates continued progress in advanced propulsion technology by Indian Space Research Organisation.

Sources: AIR & ISRO