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Assignment No. 1 (Summer 2022) Subject: Adv. I. C. Engines Course Coordinator: Dr. J. G. Suryawanshi Last Date of Submission: 04/02/2022

This document outlines an assignment for an advanced internal combustion engines course. It includes 10 problems covering topics like: 1) The effect of dissociation on temperature and power in internal combustion engines. 2) The effect of spark advance on Otto cycle engine performance and what is meant by optimal spark advance. 3) Calculating air-standard efficiency, heat addition rate, mean effective pressure, and temperature/pressure for a given Otto cycle engine. 4) The significance of distillation curves.

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92 views1 page

Assignment No. 1 (Summer 2022) Subject: Adv. I. C. Engines Course Coordinator: Dr. J. G. Suryawanshi Last Date of Submission: 04/02/2022

This document outlines an assignment for an advanced internal combustion engines course. It includes 10 problems covering topics like: 1) The effect of dissociation on temperature and power in internal combustion engines. 2) The effect of spark advance on Otto cycle engine performance and what is meant by optimal spark advance. 3) Calculating air-standard efficiency, heat addition rate, mean effective pressure, and temperature/pressure for a given Otto cycle engine. 4) The significance of distillation curves.

Uploaded by

DeepanshuKadu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Assignment No. 1 (Summer 2022) Subject: Adv. I. C.

Engines
Course Coordinator: Dr. J. G. Suryawanshi
Last date of Submission: 04/02/2022
Topics Covered: 1) Air standard cycles 2) fuel Air cycles 3) actual cycles 4) Fuels
1. Explain by means of suitable graphs the effect of dissociation on maximum
temperature and brake power. How does the presence of CO affect dissociation?
2. Discuss the effect of spark advance on the performance of an Otto cycle engine.
What is meant by the optimum spark advance?
3. A [2.9 +(0.005 * Roll No)] litre cubic capacity, six-cylinder, four-stroke Otto engine has
a compression ratio of [11 +(0.02 * Roll No)]. The engine develops [145 +(0.3 * Roll
No)] kW at 5500 rpm. Calculate (i) air-standard efficiency; (ii) the necessary rate of
heat addition; (iii) the mean effective pressure of the cycle; (iv) the peak temperature
and pressure of the cycle.
4. Discuss the significance of distillation curves.
5 The pressure and temperature of a Diesel cycle at the start are [1.1 +(0.003 * Roll No)]
bar and = [22 +(0.04 * Roll No)] OC respectively and the compression ratio is [13 +(0.02
* Roll No)]. The pressure at the end of expansion is [2.8 +(0.003 * Roll No)] bar. Find
the percentage of working stroke at which heat is supplied and heat supplied per kg of
air. Assume γ = 1.4 and Cp = 1.004 kJ/kg K.
6. Define volumetric efficiency and discuss the effect of various factors affecting the
volumetric efficiency.
7 A compression-ignition engine works on dual combustion cycle. The pressure and
temperature at the beginning of compression are [1.1 +(0.003 * Roll No)] bar and =
[28 +(0.04 * Roll No)] OC respectively and the pressure at the end of compression is
[30 +(0.003 * Roll No)] bar. If [450 +(2 *Roll No)] kJ of heat is supplied per kg of air
during constant volume heating and the pressure at the end of adiabatic expansion is
found to be [3.5 +(0.003 * Roll No)] bar, find the ideal thermal efficiency. Assume Cp
= 1.004 kJ/kg K and Cv = 0.717 kJ/kg K.
8 The initial parameters (at the beginning of compression) of the cycle of an internal
combustion engine with isobaric heat supply are [0.11 +(0.0003 * Roll No)] MPa and
[85 +(0.04 * Roll No)] OC . The compression ratio is [17 +(0.02 * Roll No)] and the heat
supplied is [880 +(2 *Roll No)] kJ/kg. Calculate the parameters at the characteristic
points of the cycle and the thermal efficiency, if the working fluid is air.
9 Find the percentage change in efficiency of a dual cycle having compression ratio = [17
+(0.06 * Roll No)] and cut-off ratio of [11 % +(0.02 * Roll No) %] of swept volume and
if Cv increases by [2.5 % +(0.002 * Roll No) %] . Given T3/T2 = [1.8 +(0.006 * Roll No)]
10 What will be the effect on the efficiency of a diesel cycle having a compression ratio of
[22 +(0.02 * Roll No)] and a cut-off ratio is [6 % +(0.02 * Roll No) %] of the swept
volume, if the Cv increases by [1.5 % +(0.002 * Roll No) %] . Take Cv = 0.717 and R =
0.287 kJ/kg K.
11 Compare Otto, Diesel and Dual cycles for the
(i) same compression ratio and heat input
(ii) same maximum pressure and heat input
(iii) same maximum pressure and temperature
(iv) same maximum pressure and work output

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