Exhaust Definition and 132 Threads

Greetings to everyone. I would like to ask how the shape of a rocket exhaust plume changes with distance, when the rocket operates in a vacuum. What I'm mainly looking for, is to see how large the diametre of the plume would be at a distance of ~20km from the nozzle. We're assuming an ordinary...

Hello everyone, I have been trying to calculate some exhaust flow rates for a while, and I am having some issues here. I was wondering if anyone could provide any insight. I am making a few assumptions for this calculation. I am assuming no fuel or air is lost through blow by gasses into the...

Homework Statement The exhaust gases from a natural gas-fired central heating boiler leave the boiler at a temperature of 70 deg C. The oxygen content of the exhaust gases is 9% by volume (dry). The rate of energy input (Gross calorific value) to the boiler from natural gas is 16kW. The gross...

In this time I try to search after information about 2 things: 1. the gas flow system in the car and the car exhaust 2. the materials that use in air pollution filters If you know good website / professor / paper / book / video lecture / other in one of this area so I will glad if you can let me...

We have a situation. Someone modified the exhaust pipe from a diesel fired equipment. Exhaust gas flows out through a 30mm internal dia pipe. The modification carried out was to reduce the diameter of the pipe to 20 mm internal dia. The Exhaust outlet temperature from the equipment was 400 deg...

Homework Statement I'm trying to find some information on "How does the dew point control the exhaust temperature of a thermodynamic cycle?" Homework Equations "The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid...

So I'm trying to calculate the effective exhaust velocity of an engine which burned aluminum oxide and hydrogen gas at a barebones minimum temperature of 973.15 degrees Kelvin (700 C, the ignition temperature) The formula I have for specific impulse is TcxRgas, where Tc is combustion chamber...

I’m interested in your views on whether any significant thrust could be obtained using the cooling air and exhaust gases from a model aircraft engine. International class control line speed models (known as F2A) achieve speeds of around 300 km/hr using 2.5cc engines and tuned pipe exhausts that...

Hello, I am working on a custom car project, and will be using a Subaru WRX 2.0 liter turbo charged engine. I did a search under the question I am looking for an answer to, but only found one thread that was closed. I hope you all might be able to educate me, on what my possible options are. I...

If I am trying to estimate a room pressure (not having any measurement devices), could I estimate it as follows: Vo = Volumetric Air flow rate supplied into Room Ve = Volumetric Air flow rate exhausted from Room out to atmosphere Pf = Static Pressure Capability of fan Pr= Pressure of...

I have a question regarding the design of rocket nozzles. I am not an engineer nor a physicist but I am involved in amateur experimental rocketry and I was curious regarding grossly overexpanded nozzles. According to Wikipedia a grossly overexpanded rocket nozzle (very bottom of the...

I've been given information that the exhaust gas contains only water and no HydroCarbons. So,the only hydrogen composition found in the exhaust gas is in the water. Similarly,the hydrogen in the air coming-in is only found in the water molecules as the incoming air is pure and without any fuel...

I am doing a project in controlling the vibration in 4 wheeler exhaust system by using dampers. But i am not sure of what kind of dampers to use. Also is it possible to add multiple dampers and one just near the exhaust manifold.

what will be the temperature and pressure at the exhaust of IC engine?

Hi Can someone tell me how exactly (physically and mathematically) is the nozzle exhaust plane defined? I “understand” the principle with simple circular openings, but not the more complex shapes (such as in the links below)...

Homework Statement An engine is operated with a special fuel mixture solely composed of carbon, hydrogen and oxygen. A fuel breakdown showed the following values: mass fraction carbon mass fraction hydrogen ,fuel density c = 0.81 h = 0.15 ρ=0.75 kg/dm³ fuel mass flow rate m_b=2 g/s relative...

hello, does anyone know if lagging a turbo and exhaust system would cause failure of the turbo. my thought is that on the lagged turbos the heat can not disperse causing early failure due to expansion of the casing, bearings and shafts. could it also effect the oil viscosity ? any thoughts...

Hi could someone please tell me the Bussards polywell reactor helium exhaust system design. Like what is the model how did he planned to achieve it and if possible some explanation? Thanks.

Hello All, I am drawing up a design for a water-cooled exhaust manifold for a small engine. It would be a simple design of an exhaust exit pipe mounted to a flange, with a tubular copper heat exchanger liquid filled coil wrapped around the exit pipe right near the cylinder. The copper would...

Is there a way you can calculate exhaust flow using intake flow and exhaust temp? Maybe I would need fuel quantity as well. I just need a rough idea.. It's for on a diesel.

When the F-35 is taking off or landing vertically, are any of the jet exhausts supersonic? I have seen the amount of thrust they produce but nothing about the Mach number. I am not looking for anything specific just whether or not the exhausts are supersonic.

Hi, I'm doing a lab at home on photosynthesis for biology, in which I have to boil leaves in ethanol, and I have a few questions about safety for this. First of all, is it at all safe to actually boil denatured alcohol/ethanol, especially where people might inhale it? And depending on how safe...

So I realize that the engine produces pressure but most of the time this pressure is 1:1 with the boost pressure when the turbo is actually doing its job (higher engine speeds/loaded). This raises the question about how you can gain efficiency if the boost you make is used for drive pressure...

Long story short I am deleting the exhaust crap off my bike to do so I need to trick my ECU into thinking its still there. I need you guys to help me figure out what I need to do so... Please refer to paint shop drawing If you could talk me though it or draw me up something It would be much...

This is all in relation to a 90 degree v8 I am looking for the highest frequency/note/tone/pitch I can get. I very much enjoy the higher, crisper, cleaner sound the european v8 makes. I hate with a passion the rumble of the harley/dumptruck American v8. I have heard flowmasters on these cars. I...

Hey guys! I'm brand new to the forum and looking for some advice. For full disclosure, I am actually an Economics major, but I absolutely love learning about mechanical engineering; more specifically automotive mechanical engineering. Haha. I have been looking all over the web for about a month...

Cyclonic separators can be used to collect water in after-treatment when hydrocarbons are burnt, but (for one thing) this expends energy in cooling the walls of the cyclone. Is there a means to, say, use a similar effect of centrifugal force to concentrate the water molecules near the outer...

Hello all, I am nearly finished with my AA, and next year I will start school at VRI at WWU. I can't wait! Until then I am working on a private project. A 1970's Kit car called a Sterling. Due to expense I cannot make this car a mid engine, so I am staying with a rear engine configuration...

While trying to deduce the answer to a physics-related (and safety-related) question, I ran across an apparent paradox. I am trying to figure out how quickly the hot gases rising off of a fire cool down. From what I had heard from atmospheric science: 1. Air is a lousy conductor of heat. 2...

hi all, i've been confused about what the difference is between fuel velocity and exhaust velocity. apparently, fuel velocity is equal to rocket velocity minus exhaust velocity. attached are screenshots of the textbook reading that confused me. if anyone can explain this section to me, i...

What is the chemical formula for car exhaust emission

Is oxygen that comes out from a car and regular oxygen the same (exactly identical) except that one is warmer than the other?

Hello All! I am new to the forum and need help. I have looked at multiple sites an looked at 328 threads titles and about 20 actual threads today to find the info I was looking for...no luck. Here is my question: I have a 12.5KW natural gas generator and want to know much heat and I can...

hey guys, i m new here, i m working at recovering waste heat from exhaust from an automobile using a heat exchanger and then turning a turbine using a working fluid such as steamor refrigerant but still mnot sure which turbine will be suitable for me to use considering the dimensions of the...

Hi guys, not sure if this is in the correct section but I'll go ahead anyway. I'm working on an automotive design project. The car that I'm designing has twin micro jet turbines, like the Jaguar CX-75, to charge and power the electric motors propelling the car. The problem that I'm trying...

Somewhere in a dark corner of the "internet" lies a video of somebody that somehow crossed the leads from the header pipes so instead of all the primaries going into one collector some go into the other side collector...that produced a very exotic sound. Can someone tell me a little more...

Before I Start here is a disclaimer - I am not a professional CAD or Mechanical Engineer to know much about this. Also, All information I have is from the internet and have NO practical knowledge. Here we go then. I am currently working on building a High Performance Free Flow Exhaust...

I'm trying to do the concept of a turbosteamer that the bmw is workking on but I'm facing few problems : the flow rate of water will be 9 ml/s and of pressure 6 bars . based on htri xchanger program , the best design of my shell and tube heat xchanger will be of 22 cm diameter and 6.4 mm tube...

My plan is to burn bio-matter like weeds and wood (or bio-fuel) in a zero-pollution scheme that collects the particulate material, oil, water and CO2 generated from burning the hydrocarbons and uses it for other purposes. It would filter out any toxins or NOx and vent N2. I know that I can...

Does anyone know any sources (i.e. car manufacturers) that provide the exhaust air flow parameters for the some specific car engines? I need stats on various otto & diesel cycle engines (small compact car engines, large semi truck engines, etc.). When I say exhaust air flow parameters, I need to...

Does anybody know how or where I can find a way to figure the Exhaust Temperature of a Rocket. I am considering a problem where I assigned 1.4 atmospheres to the Inlet gas pressure at 300 degrees C. That it exited into 1 Atmosphere at exit velocity of 325 M per second.

Hi all, I am looking for ways to make the house more efficient in winter. Are there any disadvantages to piping the clothes dryer exhaust into the house instead of outside? I do understand that there exists a small quantity of lint in the exhaust, could that be dangerous (breathing, flammable)...

So, I'm still working on designing an exhaust. The engine I'm using is the VR6, non-turbo, etc. I want to design the exhaust only under full throttle. This way I can over-design the exhaust rather than under-designing it. I'm really not sure how to find the velocity of the exhaust as it...

I wanted to know what exhaust temperature range would i get with a 48cc 4 stroke single cylinder gasoline engine operating at standard parameters. Also, what variation in engine efficiency would i get by varying exhaust temperatures using water as a coolant?

Hey, i just have a couple questions that need answers. Below I have a list of notes I have taken whilst researching how to analyze thermal and pressure stresses in a y bar exhaust. Things I need to design include the valve and the exhaust pipe itself. Am I missing anything to analyze? About...

I have done a basic test on my car at idle and have found that the exhaust pipe temperature just hits 100 deg C eg boiling point of water 1050mm away from the exhaust port. Is this a good guide to exhaust gas temperature? Can you compare other engines using this method? I also can hang...

I thought I would try to discuss this here since there seems to be a large misunderstanding in automotive forums and I want to learn the reality, not someone's theory. basically, I have a car here in which we removed one of the many mufflers. Piping is constructed as 2-1-2. It converges to...

Given a natural gas fired industrial heater dryer which gives off 70,000 CFM of 190F air at 1.1 atm air pressure, is it practicably possible to capture 24 hours worth of this heated air exhaust into a compressed storage tank? How would I calculate the theoretical maximum compression ratios...

I am trying to get some help in sizing my exhaust pipe for my 1997 Pontiac Trans Am WS-6 Can anybody point me in the right direction for equations? I pulled out my Marks handbook hoping it would help, but I couldn't find anything I have been thinking of doing this as a gas dynamics...

Hi all, I have a car with a straight through exhaust, consisting of a 4 into 1 manifold, a single pipe, then a single silencer. Between the manifold and silencer is a join. When i am driving on over run (closed throttle, decellerating) i know this joint sucks air in, as the exhaust makes a...