| 摘要 |
In a fluid system for a gas turbine engine, oil is supplied from an oil tank ( 10 ) by a constant displacement pump ( 12 ) to lubricate engine components ( 18 ). The oil is supplied to the components ( 18 ) via a heat exchanger ( 16 ) in which oil and fuel are placed in direct heat exchange relationship. The flow of oil to the components ( 18 ) is controlled by recirculating a proportion of the oil flow through a bypass ( 20 ). The bypass ( 20 ) regulates the flow of oil to the components ( 18 ) so that the amount of heat transferred to the fuel in the heat exchanger ( 16 ) is controlled. At low engine powers a greater proportion of the oil flows through the bypass ( 20 ) to reduce the oil flow to the components ( 18 ). This reduces the heat transferred to the fuel in the heat exchanger ( 16 ) and so prevents overheating of the fuel.
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