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Experimental Heat Transfer Analysis on Wavy Fin in Four Stroke Petrol Engine


Call for Papers Engineering Journal, May 2019

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Experimental Heat Transfer Analysis on Wavy Fin in Four Stroke Petrol Engine

Sathish.P

PG scholar .

(Department Of Mechanical Engineering) Kumaraguru College Of Technology,

Ayyappan .PR

Assistant Professor (SRG) (Department Of Mechanical Engineering)

Kumaraguru College Of Technology,

Abstract The engine head is one of the major IC engine part, which is subjected to high temperature . To cool the head, fins are given on the surface of the head to increase the rate of heat transfer. By doing experiment on the heat transfer on the engine head, it is helpful to know the heat dissipation inside the head. By the way of wavy shape fin structure put into use in the project is to increase the heat transfer rate by using invisible working fluid of air we know that by increasing the surface area we can increase the heat transfer rate.The main purpose of using these cooling fins is to cool the engine engine head by air. The main aim of the project is to study the heat transfer rate by different geometry with the same material figure out difference variation in temperature distribution over time

Keywordsheat transfer, wavy fins, cylinder head.

I. INTRODUCTION

An IC engine is one in which the heat transfer to the working fluid occurs within the engine itself , usually by the combustion of the fuel with the oxygen of air. Internal combustion engines use heat to convert the energy of fuel to power.In IC engine all of the fuel energy is converted to power. And after converting the heat to power excess heat must be removed cycle .The heat is moved to atmosphere by fluids low temperature due to combustion process engine temperature is not consistent throughout the power .If the excess heat is not removed, engine component fail due to excessive temperature .Heat moves from areas of high temperature to areas of low temperature area . In engine when fuel is oxidized (burned) heat is produced. Additional heat is also generated by friction between the moving parts. Only approximately 30% of the energy released is converted into useful work. The remaining (70%) must be removed from the engine to prevent the parts from melting

Fig .1 four stroke SI engine cylinder with straight fins

IC ENGINE CROSS SECTION

Peak burned gas temperature in engine is near about 2500 K and during combustion period heat fluxes may reached to 10 MW/m2, during other parts of the cycle it is essentially zero .The maximum metal temperature for the inside of the combustion chamber is much lower values due to cracking on materials aluminum alloys 400 oc prevent deterioration of lubrication oil (keep below 180 C) also spark plugs and valves

Must be kept cool to avoid knock and pre ignition problem basically we should maintain the combustion temperature to achieve high heat transfer reduce the engine efficiency

Extended fins are well known for enhancing the heat transfer in ic engine. However liquid cooled system is better than air cooled system but in SI engine air cooled system is better than liquid cooled and simpler also. Therefore it is very important for air cooling system to utilize extended surface fins effectively to obtain uniform temperature in cylinder periphery

LITRATURE REVIEW

Thermal Analysis Of IC Engine Cylinder Fins Array Using CFD

Thermal analysis of various geometry and materials in engine cylinder fin Comparison of engine heat loss, effectiveness and efficiency Specific power and efficiency are affected by the magnitude of engine heat transfer .This paper focuses on a substantial difference of heat flux exists for various places in the cylinder of an engine

Thermal Analysis Of IC Engine Heat Transfer Rate To Improve Engine Efficiency

Paper focuses on varying geometry,material.Aluminium alloy 6061 is having better heat transfer rate .efficiency and effectiveness of fins.

Thermal analysis and optimization of engine cylinder fins by varying its geometry and materials

Thermal analysis of various geometry and materials in engine cylinder fins. Comparison of engine heat loss, effectiveness and efficiency .The principle implemented in the project is to increase the heat dissipation rate by using the invisible working fluid, nothing but air. We know that, by increasing the surface area we can increase the heat dissipation rate,

OVERALL HEAT TRANSFER FROM SI ENGINE

An air cooled motor bike engine dissipates waste heat from the cylinder through the cooling fins to the cooling air flow created by the relative motion of moving motorbikes. The cooling system is an important engine subsystem. The air cooling mechanism of the engine is mostly dependent on the fin design of the cylinder head .it also depends on the velocity of air and the ambient temperature

Q=hc A (Tsur-Tamb)

For force convection ,convective heat transfer coefficient hc = 10.45-v +10 v1/2

EXISTING MODEL SPECFICATION

Greaves Mk25 Portable Engine

Engine type Four Stroke , Air Cooled. Displacement Volume 256 cc

Cylinder Head Material Aluminum Alloy Adc 12 Fin Shape Rectangular

Rated Power 2.2 kw

Speed 3000 rpm

Fuel Petrol

No Of Cylinder 1

Bore X Stroke (mm) 70 x 66.7 Continuous Hp 3.4 hp Max.Torque (Nm) 14 @ 1700 rmp No Load Min Rpm 1700

No Load Max Rpm 4000 Compression Ratio 4.67

Weight 26

Iginition Timing 28 deg btdc

Ignition System electronic

Spark Plug mico w95t2/m45z8

Fuel Capacity 4.5

Lubrication Method splash type Engine Oil 20 w 40 Sump Capacity (ml) 1100

Governor Type centrifugal fly

Starting Method rope and pully CYLINDER HEAD WITH STRAIGHT FINS

fig 1.1

HEAT TRANSFER CALCULATION

\

Heat release , Q=mcT Where ,

Q=heat released by cylinder in watts

m= mass of the heat storage liquid ,in kg, C=specific heat capacity j/kg k

T=change in temperature at inlet and outlet,in K

BOUNDARY CONDITIONS ARE MENTIONED IN THE TABLE BELOW

1

ENGINE LINEAR SPEED

50

2

TEMPERATURE OF SURROUNDING (AMBIENT)

30 O C

3

GEOMETRICAL ALTITUDE

ABOVE SEa LEVEL

4

HEAT TRANSFER COFFICIENT

W/M2 K

10

5

THERMALCONDUCTIVITY W/M2 K

92

6

NOMINAL WIND SPEED

10.4

CYLINDER HEAD WITH WAVY FINS 3D

MODEL

fig 1.2 Cylinder Head With Wavy Fins 3D Model

CYLINDER HEAD WITH WAVY FINS IN IC ENGINE

fig 1.3 Cylinder Head With Wavy Fins In IC Engine

RESULT AND DISCUSSION

Base Temperature 415o c

AIR VELOCITY Vs HEAT TRANSFER IN FIN

This graph represents the air velocity Vs heat transfer rate in fin with different profile

AIR VELOCITY Vs TEMPERATURE IN FIN

This graph represents the air velocity Vs temperature rate in fin with different profile

TIME Vs HEAT TRANSFER IN FIN

This graph represents the time Vs heat transfer rate in fin with different profile

PERFORMANCE OF IC ENGINE

AIR VELOCTY Vs TOTAL FUEL CONSUMPTION

This graph represents the air velocity Vs total fuel consumption rate in fin with different profile

SNO

Velocity Km /h

STRAIGHT Fin

Heat transfer rate q (w)

WAVY

Fin

Heat transfer rate q (w)

1

21

245

259

2

32

333

342

3

46

387

402

SNO

Velocity Km /h

STRAIGHT Fin

Heat transfer rate q (w)

WAVY

Fin

Heat transfer rate q (w)

1

21

245

259

2

32

333

342

3

46

387

402

COMPARISON OF HEAT TREANSFER ON FINS

CONCULSION

We have done experimental heat transfer analysis on wavy fins .The fin geometry and cross sectional area affects the heat transfer coefficient . During vehicles travelling high speed and distance wavy fins provide better efficiency. Wavy passage between the fins resulted in swirl being created it helps to increasing the heat transfer .Thick fins with less numbers as it helps inducing greater turbulence and hence higher heat transfer .

ACKNOWLEDGEMENT

We would like to sincerely acknowledge the en courageous effort of mechanical engineering department of kumaraguru college of technology, Coimbatore. Our heart full Thanks to faculty members who helped us in prepare this and give direction with their precious suggestion and rich experience.

REFERENCES

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