What are the effects of the ignition order of the engine from the point of view of mechanical dynamics of piston engines?
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What are the effects of the ignition order of the engine from the point of view of
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- 2. A Spark-Ignition Engine has 4 cylinders in-line, a compression ratio of 8.7 and a displacement of 2.6Liters and with S = 1.05B. Fuel used is C 8 H 18 with an equivalence ratio of 1.05 with combustionefficiency of 100%. The heating value of the fuel is 44,300 kJ/kg. While operating at 3200 rpm,mechanical efficiency is 86 % and indicated engine efficiency is 96%. Conditions at the start ofcompression stroke are 100 kPaa and 60 o C. It can be assumed that there is a 3 % exhaust residual leftfrom the previous cycle.Determine: a) P and T at cycle state points, b) mass of air per cylinder, c) mass of fuel per cylinder, d)brake thermal efficiency, e) torque produced, f) fmep, g) isfc, h) volumetric efficiency, i) Specific PowerIdentify the correct order of the cycles in the four-stroke engines analyzed in lab, with the first cycle beginning when the piston is at Top Dead Center and no air-fuel mixture is present in the combustion chamber. Combustion, Intake, Compression, Exhaust Intake, Compression, Combustion, Exhaust Intake, Combustion, Compression, Exhaust Intake, Combustion, Exhaust, CompressionQuestion: Please explain why your car engine is generally less efficient when its ignition temperature is lower. *Please be thorough with the answer.
- 2 A six-cylinder, four-stroke, direct-injection oil engine is to deliver 120 kW at 1600 rpm. The fuel to be used has a calorific value of 43 MJ/kg and its percentage composition by mass is carbon 86.0%, hydrogen 13.0%, non combustibles 1.0%. The absolute volumetric efficiency is assumed to 80%, the indicated thermal efficiency 40% and the mechan- ical efficiency 80%. The air consumption to be 110% in excess of that required for theoretically correct combustion. (i) Estimate the volumetric composition of dry exhaust gas (ii) Determine the bore and stroke of the engine, taking a stroke to bore ratio as 1.5. Assume the volume of 1 kg of air at the given conditions as 0.77 m³. Oxygen in air is 23% by mass and 21% by volume.Thermal efficiency is of key importance in power producing system design. If the engine high and low temperatures are fixed, which cycle has the highest efficiency? Group of answer choices Rankine Otto Carnot Brayton Dieselintake valve intake compression JO BI Tuel injector the temperature of the gas; power exnaust vaive 0010 exhaust The diagrams show the cylinder of a petrol engine in 4 stages. Petrol vapour and air are drawn into the cylinder, The mixture is then squeezed together, and then exploded by a spark. The explosion pushes down the piston. The exhaust gases are then expelled from the cylinder. Use the first law of thermodynamics to analyse the energy changes during the process. At each stage explain what happens to i) the pressure of the gas; ii)
- Trieed a detailed drawing Win explanatio LL Antsmi 1981x pu + 96252 اه 6. The Pre-combustion chamber design engines employ nozzle type commonly referred to as a ....... a. inward-opening nozzle b. multiple-hole nozzle. c. pintle nozzle. d. none of these. 7. If the temperature of the spark plug tip is less than 350 °C, ......... a. the plug might not work. b. the carbon deposits would increase. 8. Port injection sprays fuel....... c. pre-ignition will occur. d. none of these. a. towards the intake valve. b. in the engine cylinder. c. in the throttle body assembly. d. none of these. 9. When the fuel-air mixture changed from best power to a richer ratio, the spark advance should be........ a. increased. b. decreased. c. left unchanged. d. none of these. d. none of these. 10. Spark plugs are classified as hot plugs and cold plugs depending upon ........ a. spark gap. b. the type of plug c. the operating temperature insulator. range of the electrode tip. ---20125 750 x2.01 SP 5.Which statement(s) is/are TRUE about compression-ignition (CI) engine? OThe maximum indicated mean effective pressure of a naturally aspirated compression-ignition engine is higher than the corresponding values for an equivalent spark-ignition engine. O Unlike spark-ignition engine, there is no knock limit in compression-ignition engine. The pumping loss in a compression-ignition engine is higher that that of an equivalent spark-ignition engine. Engine torque of compression-ignition engine is varied by varying the amount of the fuel injected.Self ignition would occur in an engine using certain brand of petrol if the temperature due to compression reaches 350 degree C, when the inlet condition is 1 bar, 27 degree C. Calculate the highest compression ratio possible in order to avoid self-ignition, if the compression is according to following processes: 1- Adiabatic, with index of 1.4, 2- Polytropic, with index of 1.3 *
- Thermodynamics Fill in the Blanks: 1) In a spark-ignition engine, a mixture of fuel and air is ignited by a(n) _____________ 2) In a cold air-standard analysis, the specific heats are assumed ___________ at their ambient temperature values. 3) Ericsson and Stirling cycles operating between thermal reservoirs at TH and Tc have thermal efficiencies equal to that of a _____________ cycle operating between the same thermal reservoirs.a い يكا 4 +91- pu Answer the following statements by true or false, giving the reason for your answer: 1. Injection pressure in CI engines should be sufficiently high. 2. The purpose of the condenser in battery ignition system is to prevent spark in the ignition coil assembly. 3. An idling engine requires lean mixture of fuel and air. 4. Factors which decide optimum engine firing order are engine vibration, engine cooling and back pressure. 5. It is the duty of the header to control over speeding during CI engine operation when drastic reduction in load occurs. ---20125 750 x2.01 SP: (a) Discuss the performance and emission characteristics of a stationary diesel engine. (b) Explain the objectives, merits and demerits of EGR. (c) Explain about M type combustion chamber with a neat sketch.
