Context:
ISRO successfully conducted the first Pre-Burner Ignition trial for semi-cryogenic engine (SCE)-200.
What is SCE ignition process?
- One of the most critical parts in the development of liquid rocket engine systems.
- Achieved using a start fuel ampule – Uses a combination of Triethyle Alumnide and Triethyle Boron (developed by VSSC).
Semi-Cryogenic Engine:
- ISRO – Developing a powerful SCE that produces a thrust of 2,000 kilonewtons (kN).
- Aimed at improving the payload capacity of the Launch Vehicle Mark-3 (LVM3) and future launch vehicles.
- Oxidiser – Liquid oxygen (LOX)
- Fuel – Refined kerosene
- Lead center for development – Liquid Propulsion Systems Centre, Bengaluru
Advantages of SCE over traditional cryogenic engines:
- Refined kerosene is lighter, needs less space and can be stored at a normal temperature.
- Cryogenic engine uses liquid Oxygen as oxidiser and liquid Hydrogen as fuel (both kept at very low temperatures). It is usually the last stage of rockets.
- They can carry huge weight to a higher altitude.
- They are eco-friendlier and more cost-effective compared to cryogenic engines.
Source: ISRO
Previous Year Question
With reference to India’s satellite launch vehicles, consider the following statements:
1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.
2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
3. GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines.
Which of the statements given above is/are correct?
[UPSC Civil Services Exam – 2018 Prelims]
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 3 only
Answer: (a)
Explanation:
Statement 2 is not correct: Satellites launched by GSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
Statement 3 is not correct: GSLV Mk III is a three-stage heavy lift launch vehicle with two solid strap-one, a core liquid booster and a cryogenic upper stage.
