Engine Lab Report

locomotive locomotive engine Lab Report Diesel Engine Load/N sack Time/s dH/mmH2O Speed/r. p. m Temp/? airwave purpose/kg/H send away consumption/kg/H Air- furnish ratio Power/kw readiness/ % 40 121. 6 17. 5 3018 26. 6 130. 16 2. 47 52. 7 4. 5 0. 019 80 94. 72 17. 5 3009 26. 7 130. 14 3. 17 41. 05 8. 97 0. 059 125 72. 76 17 3009 26. 8 128. 25 4. 12 31. 13 14. 02 0. 111 171 56. 95 17 3000 26. 9 128. 23 5. 72 24. 33 19. 12 0. 161 212 46. 06 16. 5 3006 27. 1 126. 28 6. 51 19. 40 23. 6 0. 202 232 41. 20 17 3010 27. 2 128. 16 7. 28 17. 60 26. 03 0. 216 gas Engine Load/N Fuel Time/s dH/mmH2O Speed/r. p. m Temp/? Air consumption/kg/H Fuel consumption/kg/H Air- elicit ratio Power/kw Efficiency/ % 40 285 2 3000 26. 8 42. 50 3. 19 13. 32 4. 47 0. 014 109 191 7 3000 27. 4 79. 44 4. 77 6. 65 12. 19 0. 072 160 160 8 2950 28. 2 84. 81 5. 69 14. 91 17. 60 0. 125 248 110. 5 14 3000 28. 2 112. 8. 24 13. 62 27. 74 0. 215 313 93. 56 20 3000 28. 3 145. 4 9. 73 14. 94 35. 01 0. 290 374 71. 81 27 3000 28. 4 168. 9 12. 68 13. 32 41. 83 0. 317 pic Fig 1 pic Fig 2 From Fig 1, we know that stemma-fuel ratio of the flatulence engine is not changing much as the brake power increases, however for the diesel engine engine engine, the air-fuel ratio drops as the power increases. This is because the throttle which is situated in the air intake duct of the gaseous state engine.For the gas engine, the electrocution takes place in the whole cylinder, so the air-fuel ratio should be maintained to make incontestable the burning at the stake to take place rapidly enough all the time. The throttle will adjust the air-fuel ratio. For the diesel engine, the burning takes place around individual droplets of the fuel spray, therefore the output is related to the amount of fuel injected, and the air flow is not controlled. Fig 2 shows that the efficiency increases with the power for both engines, however the diesel engine make ites higher(prenominal) efficiency than the petrol engine.This is because, for the diesel engine, the input of the fuel is in the form of fuel spray. The condensate of the fuel and air is avoided. This will make the maximum cylinder volume to minimum larger, and leads to higher efficiency. So, the petrol engine should be apply in light vehicles because it is lighter than the diesel engine and it muckle reach higher power than the diesel engine which produces higher speed of the cars. And, the diesel engine should be used for the heavy vehicles, since it has higher efficiency. The heavy cars need to do more(prenominal) work, so the efficiency is more great to them.Engine Lab ReportEngine Lab Report Diesel Engine Load/N Fuel Time/s dH/mmH2O Speed/r. p. m Temp/? Air consumption/kg/H Fuel consumption/kg/H Air-fuel ratio Power/kw Efficiency/ % 40 121. 6 17. 5 3018 26. 6 130. 16 2. 47 52. 7 4. 5 0. 019 80 94. 72 17. 5 3009 26. 7 130. 14 3. 17 41. 05 8. 97 0. 059 125 72. 76 17 3009 26. 8 128. 25 4. 12 31 . 13 14. 02 0. 111 171 56. 95 17 3000 26. 9 128. 23 5. 72 24. 33 19. 12 0. 161 212 46. 06 16. 5 3006 27. 1 126. 28 6. 51 19. 40 23. 6 0. 202 232 41. 20 17 3010 27. 2 128. 16 7. 28 17. 60 26. 03 0. 216 Petrol Engine Load/N Fuel Time/s dH/mmH2O Speed/r. p. m Temp/? Air consumption/kg/H Fuel consumption/kg/H Air-fuel ratio Power/kw Efficiency/ % 40 285 2 3000 26. 8 42. 50 3. 19 13. 32 4. 47 0. 014 109 191 7 3000 27. 4 79. 44 4. 77 6. 65 12. 19 0. 072 160 160 8 2950 28. 2 84. 81 5. 69 14. 91 17. 60 0. 125 248 110. 5 14 3000 28. 2 112. 8. 24 13. 62 27. 74 0. 215 313 93. 56 20 3000 28. 3 145. 4 9. 73 14. 94 35. 01 0. 290 374 71. 81 27 3000 28. 4 168. 9 12. 68 13. 32 41. 83 0. 317 pic Fig 1 pic Fig 2 From Fig 1, we know that air-fuel ratio of the petrol engine is not changing much as the brake power increases, however for the diesel engine, the air-fuel ratio drops as the power increases. This is because the throttle which is situated in the air intake duct of the petrol engine.For the petrol engine, the combustion takes place in the whole cylinder, so the air-fuel ratio should be maintained to make sure the combustion to take place rapidly enough all the time. The throttle will adjust the air-fuel ratio. For the diesel engine, the combustion takes place around individual droplets of the fuel spray, therefore the output is related to the amount of fuel injected, and the air flow is not controlled. Fig 2 shows that the efficiency increases with the power for both engines, however the diesel engine reaches higher efficiency than the petrol engine.This is because, for the diesel engine, the input of the fuel is in the form of fuel spray. The compression of the fuel and air is avoided. This will make the maximum cylinder volume to minimum larger, and leads to higher efficiency. So, the petrol engine should be used in light vehicles because it is lighter than the diesel engine and it can reach higher power than the diesel engine which produ ces higher speed of the cars. And, the diesel engine should be used for the heavy vehicles, since it has higher efficiency. The heavy cars need to do more work, so the efficiency is more important to them.