Optimization of perforators size for a reactive muffler

Under the guidance of Dr.N.V.V.Sudheer By, Surendra

ContentAbstractIntroduction to mufflersLiterature reviewIdeologyData gatheringDesign & Its considerationsAnalysisResultReferencesFuture work

Abstract

In every reactive mufflers perforators place an important role. Here my project goal is to find out the optimum shape of a perforator & its size at similar conditions by performing cfd analysis.

Silencer kills noise in st flow by using absorbing material.Where as muffler kills noise by blocking the flow.Resonator reduces noise by using reducers.

Silencer mufflerresonatorNoise Reducers

Introduction To Mufflers

What is a muffler?Muffler components Different types of mufflers Mufflers uses & its drawbacksIntroduction to exhaust systemDifferences b/w mufflers

acoustic soundproofing device designed to reduce the loudness of the sound pressure created by the engine.Muffler components:- a)body b)inlet c)outlet d)support plates e)baffle plates f)absorbing material e)perforators ,,,,,etc.. Support platesBaffle plate

Different Types Of Mufflers

AbsorptiveReactivecombinational

Literature Review

Muffler for I.C engine-US4834214A a)it is an absorptive one b)perforaters size 0.05 to0.375 inch c) no back pressure d)tail pipe

Muffler for I.C engine-US4577724A

Exhaust muffler-US 20130048416 A1

Design & optimization of exhaust muffler

Ideology & Data Gathering

Here my idea is knowing about effect of perforators size & shape on back pressure, shear stress, force & normal force on reactive muffler.Data gathering :- dimension are taken from walkers mufflersThickness are taken from sheet metalsPressure is taken from some research site ,,,etc..

Design & Its considerations

Considerations:-Tolerance are taken as zero dimensions are taken from walkersAssembly is a welded or fixed one with respect to displacement.Sheet of 3 mm for all is considered ,,,,,etc.. Software : CATIA-V5

Analysis

Considerations:-Heat transfer to atmosphere is not consideredAir is to be at high temp & muffler is at room temp.Material is to be considered as homogeneous ,,,etc..Software: solidworks-2013(flow simulation)Inlet condition outlet condition mass flow

Temp:500kPressure:225654paTemp:298kPressure:101325pa2.91kg/sec

Result

shapeR=relative pressure

S=shear stress

H=heat flux

T=temp

Area

2P:1617000 paR:1336000 paS:62 paH:3135 w/m2 /kT:460 kP:1551610 paR:1268965 paS:H:2450w/m2 /kT:301 kP:1632500 paR:1349500 paS:65 paH:3000 w/m2 /kT:374 k2.5P:1555680 paR:1273020 paS:60 paH:2900 w/m2 /kT:375 kP:1614400 paR:1332000 paS:79 paH:2800 w/m2 /kT:365 kP:1348500 paR:1066500 paS:49 paH:5200000 w/m2 /kT:321 k

3P:1605800 paR:1325400 paS:62 paH:2700 w/m2 /kT:362 kP:1612500 paR:1329500 paS:59 paH:2850 w/m2 /kT:369 kP:1539000 paR:1257000 paS:44 paH:3200000 w/m2 /kT:343 k

References

Pressure was taken from:http://www.4wdmechanix.com/How-to-Tuning-the-Fuel-Injected-Jeep-Inline-Six-Stroker-Motor.htmlcost was taken from:http://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&SearchText=302+stainless+steel+3+mm+sheet++priceproperties of material are taken from:http://www.suppliersonline.com/propertypages/302.aspdimensions are taken from:http://www.walkerexhaust.com/catalog/walker-exhaust-systems/universal-muffler-dimension-searchMuffler for I.C engine-US4834214AMuffler for I.C engine-US4577724AExhaust muffler-US 20130048416 A1DESIGN & OPTIMIZATION OF EXHAUST MUFFLER & DESIGN VALIDATION Design And Optimization Of Exhaust Muffler In Automobiles Youtube.com(tutorials of catia;;solid works) ,,,,,etc..

Future WorkI would like to use some optimization technology like anova approach.Preparation of bookSome data have to be collected like graph & some analysis results.

,,,,etc.