29th May 2024

ISRO mentioned it has achieved a breakthrough in rocket engine expertise with the event of a light-weight Carbon-Carbon (C-C) nozzle for rocket engines, enhancing payload capability. This innovation achieved by the house company’s Vikram Sarabhai Area Centre (VSSC) guarantees to reinforce the very important parameters of rocket engines, together with thrust ranges, particular impulse, and thrust-to-weight ratios, thereby boosting the payload capability of launch automobiles, it mentioned.

Thiruvananthapuram-based VSSC leveraged superior supplies like Carbon-Carbon (C-C) composites to create a nozzle divergent that gives distinctive properties, an ISRO assertion mentioned.

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By utilising processes equivalent to carbonisation of inexperienced composites, chemical vapor Infiltration, and high-temperature therapy, it has produced a nozzle with low density, excessive particular power, and wonderful stiffness, able to retaining mechanical properties even at elevated temperatures, it mentioned.
A key characteristic of the C-C nozzle is its particular anti-oxidation coating of silicon carbide, which extends its operational limits in oxidising environments. This innovation not solely reduces thermally induced stresses but in addition enhances corrosion resistance, permitting for prolonged operational temperature limits in hostile environments, in keeping with ISRO.

The potential affect of this improvement is critical, significantly for the ISRO’s workhorse launcher, the Polar Satellite tv for pc Launch Automobile (PSLV). The PS4, the fourth stage of the PSLV, at present employs twin engines with nozzles constituted of columbium alloy. Nonetheless, by changing these metallic divergent nozzles with C-C counterparts, a mass discount of roughly 67 per cent may be achieved, the house company mentioned.

This substitution is projected to extend the payload functionality of the PSLV by 15 kg, a notable enhancement for house missions. The profitable testing of the C-C nozzle divergent marked a serious milestone for ISRO.

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On March 19, 2024, a 60-second sizzling take a look at was performed on the Excessive-Altitude Take a look at (HAT) facility in ISRO Propulsion Complicated (IPRC), Mahendragiri in Tamil Nadu, confirming the system’s efficiency and {hardware} integrity. “Subsequent assessments, together with a 200-second sizzling take a look at on April 2, 2024, additional validated the nozzle’s capabilities, with temperatures reaching 1216 Okay, matching predictions,” the discharge mentioned.

The collaborative effort concerned the Liquid Propulsion Programs Centre (LPSC) at Valiamala close to Thiruvananthapuram which designed and configured the take a look at, and IPRC, which performed the instrumentation and execution of the assessments at its HAT facility, it was famous.

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