Combustion Fundamentals MAE 5310
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This 7 page Class Notes was uploaded by Marie Nicolas on Monday October 12, 2015. The Class Notes belongs to MAE 5310 at Florida Institute of Technology taught by Staff in Fall. Since its upload, it has received 8 views. For similar materials see /class/221698/mae-5310-florida-institute-of-technology in Mechanical and Aerospace Engineering at Florida Institute of Technology.
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Date Created: 10/12/15
MAE 5310 Combustion Fundamentals STANJAN NOTES STANJAN is an easy to use DOS executable to solve adiabatic combustion equilibrium calculations You can download it directly from the course website and run it on your own computer STANJAN Summag of input Calculation of the adiabatic ame temperature of a stoichiometric methaneair mixture is used as an example to illustrate the use of STANJAN Program dialog is shown below Do you want to be instructed Species le Correct le reactants or products Enter species in phase 1 eg CH402N2 Enter species in phase 2 lt RET gt Check atoms in molecules moles ofeach species in phase I Change Setup P atm eg l T K eg 300 Sound speed Save output Monitor run See JANNAF data Start printer if desired Change SETUP 11 Use combsud for this problem y assuming you typed it right and got species list r First you must specify what you start wit I typically start with gaseous species use all CAPS if you make a typing error will have to retype the whole line Species can be separated with spaces or commas Enter condensed phases here for Methaneair comb there are none so ltRETgt These numbers come from the reactants or mixture you want to run eg CH4 1 02 2 N2 752 Probably not assuming you got summary that you expected Enter press atm of reactants Enter T K of reactants Probably not You might need to save reactant output it s going to be a summary of the thermodynamic properties of the mixture you speci ed Probably notthere aren t any iterations for reactants Probably not Your output le should be already saved under the lename you speci ed y Now you have to specify product species you will allow to be present at equilibrium The more you specify the longer the calculations will take to converge although for our purposes it won t be very noticeable and the more output you will get More importantly you have to choose species that are appropriate to the problem if you forget a major species STANJAN will still calculate equilibrium for composition you specify but this wouldn t match what would occur in practice Change option 2 Reactants or Products p Enter product species in phase 1 For CH4air CH4 C0 C02 H NO H2 H20 N NO N02 N2 0 02 would be suf cient to do a good job predicting pollutant concentrations as well as temperature This is nearly all the gases so to make it easy by selecting to select all possible combinations Products in phase 2 If you were burning rich CS would be good or if products leave system at low temp HZOL is also good For Stoichiometric Adiabatic Flame Temperature of methaneair neither is needed although you could specify them using if you so desired Products in phase 3 If you allowed condensed phase use lt RETgt to stop Check atoms Probably not Change Setup Only if you made a mistake Run options Choose the option that corresponds to the thermodynamic process which occurs between reactants at state 1 and products at state 2 Adiabatic ame temperature calculations for constant pressure corresponds to pH same as reactants or option 11 Estimate T This is used to start iteration 2200 K is good guess for HCair 3100 K is good guess for HCOZ Sound Speed Y if you re curious won t take much time Save run to le Y if want to save results lespec CH4AIRAFT might be good descriptive name eXisting le Y or N If le eXists you can choose whether to overwrite or append to le Append option allows you to save reactant and product data in same le monitor run Probably not If you want to watch interactions then Y Can even save output to le if desired and print if desired JANNAF Data Probably not Start and Stop printer if desired Change setup Do you want to do another calc If you want to change amount of reactants go back and respecify reactants and of moles don t change atom populations If you change reactants it will do a frozen composition calculation to get initial miXture properties again If you then chose not to change Setup it gives you prompt quotmix reactantsquot This is one that doesn t do anything Examples of STANJAN runs This example shows how STANJAN can be used to calculate the adiabatic ame temperature in a gas turbine engine combustor and then the composition after isentropic expansion in the turbine Note Your output may differ slightly due to version upgrade Step1 Get the enthalpy of the reactants by a run at the combustor inlet state Here we took T 400 K P 6 atm and CH4 202 752N2 The data are taken from species data le COMBSUD The STANJAN output follows Independent relative element atom population potential H 400000000E00 114094 0 400000000E00 123340 N 150400000E01 108571 Dependent atom C 100000000E00 Composition at T 40000 K P 6000E00 atmospheres species mol fraction mol fraction mass fraction mols in the phase in mixture in mixture Phase 1 Molal mass gmol 27633 CH4 95057E01 95057E01 55187E01 100000E00 02 19011E00 19011E00 22015E00 200000E00 N2 71483E00 71483E00 72466E00 752000E00 Species mols for the atom populations in mols Mixture properties molal mass 27633 kgkmol T 400000 K P 60795E05 Pa V 19796E01m3kg U 26694E05 Jkg H 14659E05 Jkg S 70201E03 JkgK Made 0 TP iterations l EQUIL iterations Step 2 Get the adiabatic ame temperature by nding the state of the products at the same enthalpy H and pressure P as the last run The species in COMBSUD are allowed as products The STANJAN output follows Independent relative element atom population potential C 100000000E00 204676 H 400000000E00 119990 0 400000000E00 165667 N 150400000E01 129931 Composition at T 231631 K P 6000E00 atmospheres species mol fraction mol fraction mass fraction mols in the phase in miXture in miXture Phase 1 Molalmassgmol 27466 C 55358E16 55358E16 24209E16 585920E16 CH4 25808E15 25808E15 15074E15 273153E15 CO 75620E02 75620E02 77120E02 800375E02 CO2 86918E01 86918E01 13927E00 919962E01 H 22987E03 22987E03 84361E05 243302E03 H2 28857E02 28857E02 21181E03 305426E02 H2O 18475E00 18475E00 12118E00 195542E00 HO 24233E02 24233E02 15006E02 256492E02 N 15822E07 15822E07 80693E08 167459E07 N2 70944E00 70944E00 72358E00 750883E00 NO 21100E02 21100E02 23053E02 223330E02 NO2 67724E06 67724E06 11345E05 716807E06 O 13180E03 13180E03 76780E04 139501E03 O2 35539E02 35539E02 41404E02 376148E02 Phase 2 Molal mass gmol 000 CS 00000E00 00000E00 00000E00 00000E00 Phase 3 Molal mass gmol 000 H20L 00000E00 00000E00 00000E00 00000E00 Species mols for the atom populations in mols Mixture properties molal mass 27466 kgkmol T 2316309 K P 60795E05 Pa V 11534E00 m3kg U 84777E05 Jkg H 14659E05 Jkg S 93791E03 JkgK Made 4 TP iterations 26 EQUIL iterations Step 3 Get the turbine exhaust temperature isentropic process by nding the equilibrium state of the same species at the same entropy S and a speci ed pressure here P 1 atm The STANJAN output this time including the sound speed follows Independent relative atom population 100000000E00 400000000E00 400000000E00 150400000E01 ZOEO Composition at T 167493 K spec1es mol fraction in the phase Phase 1 Molal mass gmol C 15608E23 CH4 93925E20 CO 33225E03 CO2 94697E01 H 16438E05 H2 20251E03 H2O 18982E00 HO 74204E04 N 278 66E1 1 N2 7145 8E00 NO 84518E04 N02 83678E08 O 4868 5E06 O2 20673E03 Phase 2 Molal mass gmol CS 00000E00 Phase 3 Molal mass gmol H20L 00000E00 Species mols for the atom populations in mols element potential 247380 137096 1 83106 133409 P mol fraction in miXture 27625 15608E23 93925E20 33225E03 94697E01 16438E05 20251E03 18982E00 74204E04 27866E11 71458E00 84518E04 83678E08 48685E06 20673E03 000 00000E00 O O O 00000E00 1000E00 atmospheres mass fraction in miXture 67862E24 54545E20 33688E03 15086E00 59977E07 14778E04 12379E00 45683E04 14130E11 72462E00 91807E04 13936E07 28197E06 23946E03 00000E00 00000E00 Mixture properties molal mass 27625 kgkmol T 1674929 K P 10133E05 Pa mols 164248E23 988372E20 349629E03 996504E01 172976E05 213099E03 199747E00 780848E04 293239E11 751956E00 889380E04 880548E08 512314E06 217541E03 00000E00 00000E00 V 49750E00 m3kg U 17272E06 Jkg H 12231E06 Jkg S 93791E03 JkgK Made 3 TP iterations 24 EQUIL iterations Sound speed isentropic 7949 ms This example shows how to use STANJAN to calculate the state behind a Chapman Jouguet detonation wave sonic with respect to burned gas Stepl Establish the state of the unburned gas here CH4 2O2 376 N2 Independent relative element atom population potential H 400000000E00 136899 0 400000000E00 131601 N 150400000E01 116842 Dependent atom C 100000000E00 Composition at T 30000 K P 1000E00 atmospheres species mol fraction mol fraction mass fraction mols in the phase in miXture in miXture Phase 1 molal mass 27633 kgkmol CH4 95057E01 95057E01 55187E01 100000E00 O2 19011E00 19011E00 22015E00 200000E00 N2 71483E00 71483E00 72466E00 752000E00 Species mols for the atom populations in mols Mixture properties molal mass 27633 kgkmol T 30000 K P 10133E05 Pa V 89084E01m3kg U 34581E05 Jkg H 25555E05 Jkg S 72459E03 JkgK Made 0 TP iterations l equilibrium iterations V 350 IBMPC Step 2 Set up the allowable species in the products and run detonation Independent relative element atom population potential C 100000000E00 186671 H 400000000E00 112399 0 400000000E00 158856 N 150400000E01 128072 Composition at T 278132 K P 1709E01 atmospheres species mol fraction mol fraction mass fraction mols in the phase in miXture in miXture Phase 1 molal mass 27071 kgkmol C 87604E13 87604E13 38868E13 940720E13 CH4 27362E13 27362E13 16215E13 293821E13 CO 23589E01 23589E01 24407E01 253303E01 CO2 69535E01 H 17133E02 HO 95081E02 H2 85651E02 H2O 17207E00 N 60727E06 N02 41395E05 NO 75774E02 N2 69650E00 O 11952E02 O2 97377E02 Species mols for the atom populations in mols 69535E01 17133E02 95081E02 85651E02 17207E00 60727E06 41395E05 75774E02 69650E00 11952E02 97377E02 11304E00 746697E01 63794E04 183985E02 59734E02 102101E01 63784E03 919753E02 11451E00 184777E00 31423E06 652108E06 70350E05 444511E05 83994E02 813693E02 72074E00 747929E00 70637E03 128340E02 11510E01 104567E01 Mixture properties molal mass 27071 kgkmol T 278132 K P 17313E06 Pa V 49340E01m3kg U 18356E04 Jkg H 87257E05 Jkg S 94599E03 JkgK Made 70 TP iterations 256 equilibrium iterations V 350 IBMPC Sound speed isentropic 9992 ms
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