THEHONGKONGPOLYTECHNICUNIVERSITY香港理工大BSE533:FireDynamicsLecture 4:Introduction to CombustionXinyan Huang,PhD, CEngAssistantProfessorDept.ofBuildingEnvironmentandEnergyEngineeringResearchCentreforFireSafetyEngineering,PolyUxy.huang@polyu.edu.hkPolyUBEEE1DrXinyanHuang
PolyU BEEE 1 Dr Xinyan Huang BSE533: Fire Dynamics Lecture 4: Introduction to Combustion Xinyan Huang, PhD, CEng Assistant Professor Dept. of Building Environment and Energy Engineering Research Centre for Fire Safety Engineering, PolyU xy.huang@polyu.edu.hk
THEHONGKONGPOLYTECHNICUNIVERSITY香港理工大1.IdealGasLaw2.DiffusionFlame3.PremixedFlame4.FlameChemistry2PolyUBEEEDrXinyanHuang
PolyU BEEE 2 Dr Xinyan Huang 1. Ideal Gas Law 2. Diffusion Flame 3. Premixed Flame 4. Flame Chemistry
IdealGasLawWhy we need to learn thepropertiesofGASbeforelearningcombustion?All combustion reactions occursCH4+20zCO2+2H2Oingaseousphase,liketheflamesupportedbynatural gasThis law also works for solid(wood)andliquid(gasoline)fuels3PolyUBEEEDrXinyan Huang3
PolyU BEEE 3 Dr Xinyan Huang Ideal Gas Law 3 • All combustion reactions occurs in gaseous phase, like the flame supported by natural gas. • This law also works for solid (wood) and liquid (gasoline ) fuels. Why we need to learn the properties of GAS before learning combustion?
Ideal GasLawGas exists everywhere,on earth,in the universe.andeveninsideyourbody.PolyUBEEEDrXinyan Huang4
PolyU BEEE 4 Dr Xinyan Huang Ideal Gas Law 4 Gas exists everywhere, on earth, in the universe, and even inside your body
Ideal GasLawBasedontheobservationinnormallife,wemayknow somebasiccharacteristics of gas:Asthe gas temperaturechange,thegas volume will change.Asthegasvolumechanges,thegaspressure will also changeThere are relationships.000betweenthe gaspressurevolume andtemperaturePolyU BEEE5DrXinyanHuang5
PolyU BEEE 5 Dr Xinyan Huang Ideal Gas Law 5 Based on the observation in normal life, we may know some basic characteristics of gas: • As the gas temperature change, the gas volume will change. • As the gas volume changes, the gas pressure will also change. There are relationships between the gas pressure, volume and temperature