What is Exhaust: Definition and 132 Discussions

An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of:

Cylinder head and exhaust manifold
A turbocharger to increase engine power.
A catalytic converter to reduce air pollution.
A muffler (North America) / silencer (UK/India), to reduce noise.Aftermarket exhaust parts can increase peak power by reducing the back pressure of the exhaust system. These parts sometimes can void factory warranties, however the European Union Block Exemption Regulations 1400/2002 prevents manufacturers from rejecting warranty claims if the aftermarket parts are of matching quality and specifications to the original parts.

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  1. R

    Rocket equation exhaust velocity question

    The rocket equation given by Delta V = Ve ln (Mo/M) says that Ve is the exhaust velocity of the rocket. The orbital velocity for Low Earth Orbit is about 7.8 Km/s. How then, is this velocity attained by a rocket which is fuelled only by a bipropellant rocket engine producing an exhaust...
  2. I

    Car Exhaust Heat: Convectional or Radiated?

    Hey everyone, a recent argument came up between two people which had to do with the temperature of a car hood. Basically, the argument was what kind of heat would an exhaust manifold mainly use to get the hood of a car hot, convectional or radiated heat. The exhaust manifold is made of...
  3. H

    Exhaust linearisation in a moving piston

    Hope someone is able to assist. I have been musing about generating greater efficiencies in ICEs and pose the following: * Consider the exhaust phase of an internal combustion engine (diesel or gasoline) in which the exhaust stroke is pushing hot gases and particulates out of a simple valve...
  4. M

    How Does a Heat Engine's Efficiency Impact Its Exhaust Heat Rate?

    Homework Statement A heat engine operates between 40°C and 380°C. Being a real engine, its efficiency is only 60% of that theoretically possible for a Carnot engine at these temperatures. If it absorbs heat at a rate of 60 kW, at what rate does it exhaust heat? Homework...
  5. S

    Rocket Exhaust Gases: Initial & After 29s Acceleration

    A rocket with initial mass of 7.30×103 kg is fired in the vertical direction. Its exhaust gases are ejected at the rate of 6.00×101 kg/s with a relative velocity of 2.100×103 m/s. What is the initial acceleration of the rocket? What is the acceleration after 29 s have elapsed?
  6. Artlav

    What causes the formation of beads in rocket exhaust plumes?

    Not sure if it's chemistry or physics, but the latter seems more like it. Let's take a look at pretty much any large rocket with smoke-less exhaust during it's launch, for example the recent one: As you can see, there are a kind of beads in the exhaust plume at seemingly constant...
  7. V

    Jet Exhaust Velocity: Turbojet & Turbofan Engine Advantages

    in turbojet and turbofan engine the hot gas exhaust velocity is less to compare with after burener turbojet and turbofan engine. in case the turbojet and turbofan enigne hot gas exhaust velocity is high without after burner, what is the advantage? assume it does not consume any additional fuel
  8. D

    Exhaust gas heat exchanger calculations

    Hi Guys newbie here. Im trying to design a CHP system in which an engine with steady exhaust gas flow uses a heat exchanger to heat water for use around the home (central heating, washing water etc). The engine specifics are to be developed but i need to be able to size a heat exchanger so i...
  9. E

    Is My Calculation of Rocket Exhaust Velocity Using N2H4 and Aerozine 50 Correct?

    Please check my calculations for the exhaust velocity of a rocket that uses Nitrogen Tetroxide (N2H4) & Aerozine 50 as its propelants. This is the formula that I'm using to find out the exhaust velocity: ## V_e = \sqrt{{\frac{T*R}{M}}*{\frac{2*k}{k-1}}*[1-(P_e/P)^(^k^-^1^)^/^k] } ## Ve =...
  10. aussie-girl

    Finding exhaust temp in heat engine problem (entropy)

    Homework Statement The question is: An ideal heat engine takes in heat Q(in) at a temp T(h). It exhausts heat Q(out). So: (a) how much work is done by engine (b) what is efficiency of engine (c) what is exhaust temp of engine and (d) calculate the answers to above for heat input of 460J at a...
  11. E

    Rocket Engine Exhaust Velocity

    I want to calculate the exhaust velocity of a rocket. This is the formula that I found at http://en.wikipedia.org/wiki/Rocket_engine_nozzles which is: V_e = \sqrt{{\frac{T*R}{M}}*{\frac{2*k}{k-1}}*[1-(P_e/P)^(^k^-^2^)^/^k] } Ve = Exhaust velocity at nozzle exit, m/s T = absolute...
  12. E

    Specific Impulse and Exhaust Velocity

    I would like an explanation with this formulas for a rocket engine and any other engine to calculate its exhaust velocity and its specific impulse. I realized that this formulas neglect combustion temperature, engine pressure, speed of the fuel is injected, etc. -----------------------------...
  13. P

    Thermodynamics exhaust power question

    Homework Statement An electric generating station is designed to have an electric output power 1.20 MW using a turbine with two-thirds the efficiency of a Carnot engine. The exhaust energy is transferred by heat into a cooling tower at 98°C. (a) Find the rate at which the station exhausts...
  14. DaveC426913

    Verifying Mach 10+ Shocks in Shuttle Launch Exhaust

    My friend (whom I normally trust) told me something I did not know and would like to verify. We were watching a shuttle launch, talking about the main engines which, while much fainter than the boosters, can be seen in the right light...
  15. S

    Reducing Diesel Engine Exhaust Soot w/ DPF & Scrubber

    Hi, everyone. Again...I meet some problem in my work. My boss want to reduce the exhaust soots from a Euro 0/1 engine. Here is the problem: 1. If I use conventional DPF, how can i know the radius and the length of the DPF filter required for the engine? (The exhaust gas CFM is known)...
  16. L

    Carnot engine efficiency and exhaust problem

    Homework Statement The exhaust temperature of a Carnot heat engine is 121◦C. What is the intake temperature if the efficiency of the engine is 13.4 %? Answer in units of ◦C. Homework Equations e=1-(Tc/Th) The Attempt at a Solution This seems like just a plug and chug problem...
  17. B

    What Is the Density of Exhaust Gases from a Honda CBR 600RR?

    Hi I'm trying to find a value for the density of the exhaust gases emitted from a Honda CBR600 motorcycle engine with not much luck. I only need an approximate value so the density from a similar engine would suffice... Can anyone help?
  18. P

    Calculating Exhaust Gas Speed for a 4200kg Rocket Launch

    Homework Statement A 4200kg rocket is to be accelerated at 4.0g at take-off from the Earth. If the gases can be ejected at a rate of 28 kg/s, what must be their exhaust speed? Homework Equations Fthrust=mv2-mv1/t2-t1 The Attempt at a Solution Multiplied 4200kgx4x9.8/28kg/s=-5900
  19. B

    Automotive Design Automotive Exhaust: Headers & Noise Attenuation

    Hi, can anyone point me in the direction of some good information relating to the design of automotive exhausts? In particular design of headers and calculations for noise attenuation. Thanks!
  20. R

    Question about exhaust velocity and terminal velocity

    I had made a model assuming a relativistic rocket accelerating with constant power,variable acceleration,variable total mass the result however is somehow counterintuitive. The less exhaust velocity the rocket have, the higher terminal velocity it will have. Is that means I did something wrong ?
  21. F

    What are the exhaust gas temperatures of the SSME rocket motor?

    I was wondering if anyone here happens to know the temperatures related to the SSME's ( or any rocket motor like it ) exhaust just as it passes through the nozzle? Actually, temperatures in the combustion chamber, nozzle, etc would be beneficial to know as well. Thanks again.
  22. A

    Fluid properties of a diesel exhaust

    Hello, Anyone know where I can get fluid properties (specifically kinematic viscosity) of the combustion exhaust form a diesel generator (i am designing an exhaust system and I need to calculate fluid flows). I am not sure the exact chemical makeup of the diesel fuel. An estimation would be...
  23. Aquafire

    What is the composition of exhaust fumes from petrol and diesel engines?

    In regards to two types of engines.. What gases (by percentage) are to be found in conventional petrol driven internal combustion engines, such as found in cars ? What gases (by percentage) are to be found in conventioanl diesel driven internal combustion engines, such as found in trucks ...
  24. 5

    Exhaust back pressure on a 4 stroke ICE?

    Would someone explain to me why back pressure is not needed on a 4-stroke engine and what exactly is exhaust back pressure? Thanks guys and gals.
  25. honestrosewater

    Why water cracks hot exhaust manifold

    This cute mechanical engineer mentioned in a message that he had designed some manifolds, so that's why I'm asking this (in addition to my general interest in physics, of course). I'm not sure if they were intake or exhaust manifolds, but that's not the problem now. I figured that...
  26. T

    Extra power from 40 mph exhaust fan

    Say I have a commercial building that has a 24 inch diam. exhaust fan that is blowing approx 40 mph wind out of the building. I wonrder if I can make good use of this wind by mounting a 24-26 inch pipe that may be 6 to 10 ft long on the outside of the building. I imagine cutting out sections in...
  27. V

    Aircraft exhaust causes cirrus cloud formation

    In an edition of the New Scientist it says: "The streams of water vapour and ice particles that form behind an aircraft, called contrails, are known to create cirrus clouds. These clouds can trap heat radiating from the Earth's surface and thus add to global warming" How big an addition to...
  28. K

    Help Finding Exhaust Valve for Newbie Engineer

    Hi, I'm a newbie :frown: Now,I'm studying about general engineering! And I had difficulty finding materials of EXHAUST VALVE. Everyone,can you help me? Where and how I can get them?
  29. F

    Calculating Heat Exhaust from a Heat Engine

    I'm not sure if I'm interpreting this question correctly A heat engine operated between 40C and 380C. Being a real engine, it efficiency is only 60% of that theoretically possible for a Carnot engine at these temperatures. If it absorbs heat at a rate of 60kW at what rate does it exhaust...
  30. E

    Rocket Fired in Deep Space: Calculating Exhaust Gas Speed

    A rocket is fired in deep space, where gravity is negligible. In the first second it ejects (1/160) of its mass as exhaust gas and has an acceleration of 15.3 m/s^2. What is the speed V(gas) of the exhaust gas relative to the rocket?
  31. Clausius2

    Exploring Rocket Engines Exhaust Modes

    When I was viewing some photos about rocket engines (spatial ones), I wondered me in what mode is operating the nozzle in the normal working.I am going to try to explain it better (do not show me a strange face yet). I studied the different exhaust modes of a convergent-divergent nozzle...
  32. T

    Maximizing Exhaust Flow for Car Racing: A Beginner's Guide

    I'm an EE trying to learn the basics of fluid dynamics and CFD, due to my interest in car racing. Currently I'm looking at the flow through exhaust systems to get a feel for what allows the most airflow and therefore the most horsepower. I set up the problem by forcing a boundary condition at...
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