| 摘要 |
A system for assisting in the atomisation of liquid particles conveyed in a gas stream flowing along a flow path having a rigid boundary, said system involving the creation of one or more shock waves in the gas stream. In a preferred embodiment, the system comprises a fuel injection nozzle ( 10 ) comprising a fluid flow passage ( 43 ) terminating at a discharge orifice ( 15 ) and incorporating a delivery port ( 33 ) defined between a valve seat ( 31 ) and a valve member ( 23 ) movable with respect to the valve seat for opening and closing the delivery port. Fuel is delivered along the fluid flow passage ( 43 ) into a combustion chamber through the discharge orifice ( 15 ) upon opening of the delivery port ( 33 ). The valve member ( 23 ) devines an inner boundary surface ( 47 ) of the flow passage ( 43 ) and the valve seat ( 31 ) defines at least part of an outer boundary surface ( 45 ) of the flow passage ( 43 ). The inner and outer boundary surfaces ( 47, 45 ) are configured to generate one or more shock waves in an air-fuel mixture flowing at supersonic speed therebetween.
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