Read the following technical report summary and fill in the blanks with the exact details provided in the passage:
During sea trials of high-efficiency gas turbine propulsion units, naval technicians observed that secondary intercoolers reduce overall compression work only when intake temperatures exceed 45°C. Under cooler operating conditions, the bypass valve diverts pressurized air directly into the recuperator to prevent thermal shock across the turbine rotor blades. Standard service schedules require lubrication filter replacements every 300 operating hours, whereas the ceramic thermal barrier coatings on combustion chamber liners are inspected strictly at 1,200 operating hours to check for micro-fracturing.
Answer:According to the passage, compressed air is routed directly into the recuperator by the bypass valve to prevent 【thermal shock】 across the turbine blades, and the ceramic thermal barrier coatings are inspected at 【1,200】 operating hours.
Answer
thermal shock; 1,200
The passage explicitly states that diverting pressurized air directly into the recuperator prevents thermal shock across the turbine rotor blades, and that ceramic thermal barrier coatings are inspected strictly at 1,200 operating hours.
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