Semi-Cryogenic Engine

07.03.2025

Semi-Cryogenic Engine

Why in the news?   

ISRO recently successfully conducted the hot test on a semi-cryogenic engine (SE2000), coming closer to finalising the crucial cryogenic stage.

About Semi-Cryogenic Engine:

• A semi-cryogenic engine (SCE) is a liquid rocket engine that uses liquid oxygen (LOX) as an oxidizer and refined kerosene as fuel.
• The Indian Space Research Organisation (ISRO) is developing a semi-cryogenic engine with a thrust of 2000 kN to power the booster stages of future heavy-lift launch vehicles. This engine utilizes a combination of liquid oxygen (LOX) and refined kerosene (RP-1) as propellants.
• The semi-cryogenic engine offers several advantages over traditional cryogenic engines, including:
  • Higher Density Impulse: The LOX-kerosene combination provides a higher density impulse compared to LOX-liquid hydrogen, resulting in improved performance.
  • Cost-Effectiveness: Kerosene is more cost-effective and easier to handle than liquid hydrogen, reducing overall mission costs.
  • Operational Efficiency: Kerosene can be stored at ambient temperatures, simplifying storage and handling requirements.
• The development of this engine is expected to enhance the payload capacity of ISRO's existing launch vehicles, such as the LVM3, and is also planned for use in future launch vehicles like the Next Generation Launch Vehicle (NGLV).
• Difference between Semi-Cryogenic Engine and Cryogenic Engine:
  • Unlike a cryogenic engine, a semi-cryogenic engine uses refined kerosene instead of liquid hydrogen. The liquid oxygen is used as an oxidiser.
  • The advantage of using a semi-cryogenic engine is that it requires refined kerosene, which is lighter than liquid fuel and can be stored at a normal temperature.

                                                         Source: Indian Express

Consider the following statements with respect to Semi-Cryogenic Engine:

Statement-I: It uses liquid oxygen as an oxidizer and refined kerosene as fuel.

Statement-II: The use of kerosene increases the overall mission costs.

Which one of the following is correct in respect of the above statements?

A.Both Statement-I and Statement-II are correct, and Statement-II is the correct explanation for Statement-I.

B.Both Statement-I and Statement-II are correct, and Statement-II is not the correct explanation for Statement-I.

C.Statement-I is correct, but Statement-II is incorrect.

D.Statement-I is incorrect, but Statement-II is correct.

Answer  C