A maximum ignition delay Tid of 20° is required for acceptable cold start ignition of an automobile diesel engine. The engine stroke is 80 mm, the cranking speed Wis 200 rpm, and the polytropic coefficient n for compression to top dead center is 1.20. The fuel cetane number is 45, and the inlet air temperature and pressure are 250 K and 1 bar. What is the minimum compression ratio needed to have an ignition delay no longer than 20°?

A maximum ignition delay Tid of 20° is required for acceptable cold start ignition of an automobile diesel engine. The engine stroke is 80 mm, the cranking speed Wis 200 rpm, and the polytropic coefficient n for compression to top dead center is 1.20. The fuel cetane number is 45, and the inlet air temperature and pressure are 250 K and 1 bar. What is the minimum compression ratio needed to have an ignition delay no longer than 20°?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Do asap
A four - cylindev SI engine with a Compression ratio dir - Standard 3000 RPM Using ethyl alcbhol as fuel. Conditions in the cylinders at the start of the compression Stroke ave 60 c and tol kpa. Combustion efficiency %=97%. . Write the balanced stoichiometeric chemical équation rc= 10 operates on an Otto cyele at for this fuel. Calculate : a- AF if the engine operates at an equivalance ratio += 1.10. b- Peak temperature in cycle Ec]. C- Peak pressure in cycle [kpa].
Please answer
13. The pressures on the compression curve of a diesel engine are at th stroke 1.4 bar and at th stroke 14 bar. Estimate the compression ratio. Calculate the air standard efficiency of the engine if the cut-off occurs at tth of the stroke. (Ans. 18.54 ; 63.7%)
Do fast
The factors that tend to increase detonation is SI engine led to reduce knocking in C1 engine. Dis this statement with reference to the following influencing factor 1. Compression ratio 2. Inlet temperature 3. Self-ignition temperature of fuel 4. Time lag of ignition temperature of fuel, and 5. Combustion chamber wall temperature
7 A four-cylinder, four-stroke SI engine, having a bore of 10 cm and stroke 9 cm runs at 4000 rpm. The fuel used has a carbon content of 84.50 per cent and hydrogen content of 15.50 per cent by weight. The volumetric efliciency of the engine at Tuế of full thrott l at 4041 lan is 0.85 referred to 300 K and 1 batue ve engine is to pplied we of air coeflicient 0.95 when finning at 75% of full throttle. Calculate the throat diaweter of the vent uri if the air velocity at broat is not to exceed 200 1 rate of fuel flicien kg/s at the pressure drop at venturi o 1at. Discharge coellicient for the venturi is 0,8 and the area ratio of the venturi s 0.8. Take R for air as 0.287 kJ/kg K and for luel vapour is 0.09 kJ/kg K. а mixture iender the above operating conditions. vealculate the lution
use perrys chem eng handbook note: this is solution thermodynamics
3.1 A 3 liters S.I. V6 engine that operates on a four-stroke of 3000 revolution per minute, the compression ratio is 10, the lengths of the connecting rod and the crank offset are 15 cm and 4 cm respectively, the combustion is completed at 35° of the crankshaft rotation after I need an answer as soon as possible, and I hope it will be clear. Greetings, my bro. TDC, the engine is running with the stoichiometric air-fuel ratio, mechanical efficiency 90%. If the engine is connected to a dynamometer which its reading of 100 kW. Calculate: 1-piston speed at end of the combustion, 2-volume of the combustion chamber at end of the combustion, 3-engine torque, 4- indicated mean effective pressure and 5-break specific fuel consumption.
At injection pressure of 150 bar a sprav penetration of 25 cm in 20 milliseconds is obtained Ia njection pressure of 25Qar had been used, what would have been the e taken to penetrof same dis- combustion chambef density. The tance. Assume the same orificear. combustion chamber pressure is 25 bar. Use the relation where S is penetration in cm I is time in millisecond Ap is the pressure difference between injection pressure and combustion chamber pressure
this answer i need relative efficiency =62.95 only dont send wrong solution
COMBUSTION ENGINEERING In an air-standard Otto cycle engine, the following data were obtained: k = 1.4 , C, = 1.0045 ,C, = 0.7175 , P1 = 103 kPa , t, = 26°C, t2 = 414°C, tz = 2527°C, kgK kg-K t4 = 945.8°C. To be done: a. Find the compression ratio r. A. 6,5 В. 7 C. 7.5 D. 8.0 E. None of these b. Find the pressure at the end of the compression stroke p2. А. 1804 КРа В. 1894 КРа С. 1994 КPа D. 2004 КРа c. Find the pressure at the end of heat addition. A. 7700 kPa B. 7719 kPa C. 8019 kPa D. 8800 kPa E. None of these d. Find the pressure at the end of the expansion stroke P4. A. 410 kPa В. 420 kPa C. 8019 kPa D. 460 kPa E. None of these e. Find the Heat added qa to the cycle, in kJ/kg air. A. 1615 kJ/kg C. 1555 kJ/kg E. None of these B. 1575 kJ/kg D. 1516 kJ/kg f. Find the work of the cycle wey, in kJ/kg air. A. 866.1- kg air B. 877.1 k) kg air C. 880.2- D. 900- E. None of these kg air E. None of these kg air Page 1 of 2 g. Calculate the cycle efficiency for the cycle, in percent. A. Ncy =…