北航燃烧与燃烧室课程课件c_c_9_1

《燃烧与燃烧室》
热能工程系
授课专用
How to predict the performance of a pressure swirl atomizer?
《燃烧与燃烧室》
热能工程系
授课专用
Applications-3
Pressure swirl atomizer (离心雾化喷嘴)
• Early aircraft engine, such as Chinese WP6(1963), WP7(1966), J79(1954) of USA, BK-1(1948) of Russia etc
RB199
《燃烧与燃烧室》
热能工程系
授课专用
Applications-2
• Engine developed
Rotary atomizer (旋转喷嘴)
by Turbomeca of France, such as Marbore(1951), WZ8,
WJ9, F402(1958),
J69(1955) etc
《燃烧与燃烧室》
热能工程系
授课专用
Photographs illustrating spray development in a swirl atomizer from an experiment
Distorted pencil Onion stage
Tulip stage
Fully developed spray
(离心雾化喷嘴)
Rotary atomizer (Mechanical)
(旋转喷嘴)
Airblast atomizer (aerodynamic)
(空气雾化喷嘴)
《燃烧与燃烧室》
Vaporizer (蒸发管喷嘴)
热能工程系
授课专用
Applications-1
• Engine developed by Rolls Royce of Britain, such as Mamba(1946), Pegasus(F402,1958), RB199(1972) etc
《燃烧与燃烧室》
热能工程系
授课专用
Requirements for atomizers(你认为?)
➢ Provide good atomization over a wide range of fuel flow rates
➢ Rapid response to changes in fuel flow rates ➢ Freedom from flow instabilities ➢ Low cost, light weight, ease of maintenance and
空气流动的匹配）
➢ Combustion Performance（燃烧性能） ➢ Liner Cooling（壁面冷却）
《燃烧与燃烧室》
热能工程系
授课专用
9.1 Fuel atomization
The main functions of atomizer? ➢ Fast evaporation and combustion ➢ Improve fuel/air mixing
热能工程系
授课专用
Chapter 9
Performances of Aircraft Engine Combustor
《燃烧与燃烧室》
热能工程系
授课专用
Chapter 9. Performances of Combustor (上节课内容？)
§9.0 Preface §9.1 Fuel Atomization §9.2 Combustor Aerodynamics §9.3 Fuel Dispersion §9.4 Combustion Performance §9.5 Film Cooling §9.6 Summary
《燃烧与燃烧室》
热能工程系
授课专用
9.0 Preface
Performances of combustor determined by: ➢ Fuel Atomization(燃油雾化) ➢ Combustor Aerodynamics（燃烧室空气动力学） ➢ Match of fuel droplets and air flow（燃油油雾与
《燃烧与燃烧室》
热能工程系
授课专用
Applications-4
Fra Baidu bibliotek
•
Airblast atomizer (空气雾化喷嘴)
Engine developed after
1960’s, such as CF6(1971),
CFM56(1979), GE90(1995), F101(1970), F404(1980)，
• A liquid sheet is formed with a hollow cone shape downstream of orifice
• Sheet breaks down into droplets
《燃烧与燃烧室》
热能工程系
授课专用
Stages in spray development with increase in fuel injection pressure for pressure swirl atomizers
PW4000(1987), Trent(1990),
RB211(1972), F100(1974), F119(2004)，太行……
《燃烧与燃烧室》
热能工程系
授课专用
Flows in pressure swirl atomizers(基本现象)
• Fuel enters the final orifice with an appreciable tangential velocity
• As a part of airblast atomizer, such as F101(1970), F110(1986), CFM56(1979(, GE90(1995) etc
Chinese WP7 engine(1966)
American F110(1986)
American CFM56(1979)
removable for service ➢ Robustness and reliability
《燃烧与燃烧室》
热能工程系
授课专用
Main types of atomizers(分类原则？why?)
Vaporizer (Heat) (蒸发管喷嘴)
Pressure swirl atomizer (Pressure)