Question

Question 4

(a): What are various types of ignition system that are commonly used

(b): Describe in brief the stages of combustion in spark ignition SI engine.

4 (c): State briefly influencing the flame speed

4 (d): What are the factors that affects the delay period in compression ignition (CI) engine.

Answer 1

h) wsat ane veTics (yres ofignition syplem that one Comenit cused (1) SPq仆工gnition System . It is the systermo cuith which the gir fuel mioxtue . It is Commonly used in Petzol Ergire Tis sstem is mainly used in Diesel ー> Here ignition of fuel talues place withthe help of hot compressed cǐγ (b) Describe in bxief the stoses of corrhusian in Spariz igpition These qre 3 Stacges of combusthion inSr Ergine 1,49nihon Lag Skage Inthis stae these is G ceslcin time intesvol inthe between instont of Spazk and instont where +here is q notis Oble γ¡se in Pressure due to combustion. This time lag is called Iapion dag (2) Flarme Psopagation stoge Orme the fiqme is formed at "b"iSboulc be self sus oined ard mest be able to Profpeote +hreasb the mithuve, 그 is possible when the rate of choro e of boat genexotion by burning is grealeyo heol (os by iarn beg huring 's gred ame

Combustion cuill rot Slop 아 Poi ,"C", bat (ort inoAG afley ahoipin peak pressure a Point c" This commbustion is herown os afieg bar ei pition Lag point of Combos Compression Line 6o 50 10 30 TOCc 20 t0 60 80 C) Stages Eogine speed pori timang io pet rol Ercyine fuel Injecton time in dliesel Ergine Propesties of fuel → Types of con busHors Combes ins

CenFlome speed is the measured yote of expuns ion of the Florre frontin a combc,stion γection". (ch whol are the fochersヂrot af fed delay period normpress ion ° Compression〕 20'Ho e Engine speed 。Atoma ization of fuel ond duratton of,Injection 、Qcolily of fuel 。Trtoke tempeTQ tunge and pressure