ISRO successfully tests boot-strap mode start on CE20 cryogenic engine
Bengaluru (PTI): The ISRO on Wednesday announced that it has successfully demonstrated the boot-strap mode start test of the CE20 Cryogenic engine, which powers the upper stage of the Launch Vehicle Mark -3 (LVM3) rocket.
The test was conducted for 10 second under vacuum conditions at the High-Altitude Test (HAT) facility at ISRO Propulsion Complex, Mahendragiri on November 7, it said.
According to ISRO, the CE20 cryogenic engine is already qualified for operation at thrust levels between 19 and 22 tonnes with a single start in flight and is cleared for use in the Gaganyaan missions.
Under normal conditions, the engine ignition begins under tank head pressure, followed by a turbopump start up using a stored gas start-up system, the space agency said. For future missions, multiple in-flight restarts of the CE20 engine will be required for mission flexibility, towards multi-orbit missions.
With the current configuration, each restart requires an additional start-up gas bottle and associated systems, leading to a reduction in vehicle payload capability, it said. "Hence, achieving boot-strap mode start - where the engine builds up to steady operation without external start-up assistance - is essential."
During the test, a multi-element igniter was employed in both the thrust chamber and gas generator to facilitate boot-strap starting, the agency added.
"In this test, following the ignition of the thrust chamber, the gas generator was ignited under tank head conditions, and the turbopumps were started without the use of the start-up system. Subsequently, boot-strap mode build-up and steady-state operation of the engine were successfully demonstrated," it said.
"With this achievement, ISRO has successfully demonstrated boot-strap mode starting of a gas-generator cycle cryogenic engine without any auxiliary start-up system, perhaps for the first time in the world - a significant milestone towards enhancing the restart capability and mission flexibility of future LVM3 flights," it added.
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Karnataka govt tables Rs 14,767 cr supplementary estimates in assembly
Bengaluru (PTI): The Karnataka government on Monday tabled the supplementary estimates in the assembly, totalling Rs 14,767 crore of additional expenditure for the current fiscal.
Tabled by Revenue Minister Krishna Byre Gowda on behalf of Chief Minister Siddaramaiah, supplementary estimates are additional expenditures incurred by the government over and above the budget provisions.
In the fiscal ending March, additional expenditures include Rs 147 crore on the Sadhana Samavesha to mark two years of the Congress government and Rs 223 crore for railway barricading to prevent human-elephant conflict.
As per the supplementary estimates, the government spent Rs 1.25 crore to purchase a Volvo XC90 for former Prime Minister H D Deve Gowda.
It also includes -- Rs 1,025 crore to clear various irrigation works bills, Rs 15 crore for helicopter and air travels by Governor, CM, ministers and other VIPs, Rs 110 crore towards scholarship and tuition fee reimbursement for minority students, Rs 15 crore for development of various temples, maths and trusts.
The government also spent Rs 1.4 crore to print a book comprising 'selected' speeches of Governor Thaawarchand Gehlot, Rs 50 lakh to clear pending electricity and water bills of ministers' residences, Rs 10 crore towards rehabilitation of families affected by landslides at Meppadi in Wayanad, Kerala.
Rs 5 crore each for Brahmin Development Board and Arya-Vysya Development Corporation, Rs 60 lakh to Supreme Court senior advocate Kapil Sibal for two appearances representing the government, Rs 5.13 crore towards bills from the Belagavi winter session of the legislature, Rs 5.5 crore towards pending bills from the 2019 and 2021 Assembly bypolls and the upcoming Davangere South and Bagalkot bypolls, are among the expenditures incurred.
