Engine Definition and 999 Threads

please explain engine braking? the definition i found was " braking effect caused by throttle position induced vacuum in petrol engines".In what way is this better than external braking?

Hey, I'm an electrical engineering student and I'm trying to design a solar dish which converts the heat from sunlight into electricity. I managed to make a small stirling engine with the results i got from google (The stirling engines made from coke cans). I was wondering how costly...

A jet engine develops 1 * 10^5 n of thrust in moving the airplane forward at a speed of 900 km/h. What is the power developed by the engine? I thought I needed to convert 900 km/h to m/s, so I did and I got 15000 m/s. The only equation I see to use for this is: P = Fvcosθ When I...

Homework Statement A steam engine has a cylinder 80cm in diameter with a piston that has a total travel length of 1.8m. Assume that there is no "dead space" between the cylinder head and the piston when the piston is farthest in the cylinder. Steam is piped into the cylinder head from an...

Advice needed please with the design of cooling vents, louvres on the cowling of a radial engine. Plane is a Sukhoi, as per vid links below, 76 inch span 37cc petrol engined radio control. Cooling will be from cutouts in the cowl approx 20 x 80 mm with a flat plate louvre at the leading edge...

Homework Statement The hot reservoir of a heat engine is steam at 100 while the cold reservoir is ice at 0. In 1.3 of operation, 12 of steam condenses and 59 of ice melts. What is the power output of the heat engine? Homework Equations W=Q_h - Q_c n=W/Q_h=1 - (T_c/T_h) Q=ML...

Hi there, my first post on this forum and I hope its in the right place ! My question is this, in an exisitng air-cooled motorcycle engine what is the viability of using heat pipe technology to cool exhaust gas temperature? Using heat pipes to remove heat from exhaust valve areas to external...

What is the fastest speed ever recorded, achieved by a internal combustion piston engine on a land vehicle, and not an aircraft/propeller? I know that some top-fuel dragsters can exceed 300 MPH.

Hi you all Seaching in internet, I have not found an answer to this: In a air-gasoline stechiometric mixture, what can be the volumen relationship between the unburned (intake gas) and final exhaust gases?. I guess temperature is important, but let's consider a normal working...

Homework Statement Engine: 100 tonnes, with 1,000N frictional force Train: 400 tonnes, with 20,000N frictional force Speed = 80km/hour Engine is exerting a power of 4000kW Find the tension in the couplings between train and engine The Attempt at a Solution I'm not sure where to...

! Cyclic variation of engine torque If the cylinders fire sequentially according to the fire order 1-2-4-3 What is the pattern of the cyclic variation of each cyclinder engine torque and the resultant engine torque?

can anyone please tell me what is the gas pressure which applies on piston head just after combustion in cylinder its very urgent and necessary for me to know this please help me

I once saw an engine study that uses solenoids in compensating engagements much like the internal combustion engine. It was a small contraption but it worked. It used 12v dc current. I am just wondering if the engine can produce enough electricity to recharge the battery it uses if an alternator...

The gas in a 748mL cylinder of a diesel engine has a pressure of 1.72 atm at 306K. What will be the volume of the gas when the piston compresses it to 46.5 atm and 777K?

Does the piston ever "stop" moving in a running engine? well guys...does it?

1. The pressure is constant at 1Mpa how come it goes up after touching saturation vapor line.?Shouldn't it remain constant throughout? Please look at the Tv diagram below: http://www.ent.ohiou.edu/~thermo/Intro/Chapt.1_6/ideal_gas/tv_ideal.gif 2. Why quasi-static equilibrium is necessary...

Before I get flamed for this, I am not running a gasoline engine directly with normal fuel oil or veg oil- I made a gasifier. My gasifier is lame at the moment, but is just for testing purposes. It consists of a small fuel reservoir, suspended several feet up, then it flows down through about...

Dear All, Please help me about how to calculate the requirement inertia of flywheel when i changing from 1.8 m to 1.2 m diameter flywheel for the total system inertia. The mass for engine is 5200kg.

Homework Statement This is from "Equilibrium Statistical Physics" by Plischke and Bergerson, problem 1.1: "Consider a Carnot engine working between reservoirs at temperatures T1 and T2. The working substance is an ideal gas obeying the equation of state [ PV=Nk_BT ], which may be taken to be...

I`ve had a new idea in designing a pulse jet by adding a valve in it... According to my intuition and logically this increases the output many folds and I`ve given sufficient reasons for suggesting it. I have a powerpoint of my idea that I have made and I request any of you to please go through...

I've been trying to understand why fuel economy decreases when the engine gets into higher RPMs. That is, if you put the pedal to the metal and quickly accelerate to 40 MPH, your engine operates much less efficiently than if you slowly accelerated to 40 MPH. Here's where it seems the...

the idea for an Antimatter catalyst engine is probably my favorite idea of any propulsion that can be easily attained by a type I civilization. We're a type 0.78 civilization and to build an antimatter beam core engine (an antimatter engine that has a 1:1 matter/antimatter anhialation drive)...

Hey all...So i have this project, to use any other liquid apart from water in a solar powered steam engine. At the moment i am still in research phase, and have been reading on quite a few liquids although i have been concentrating on ethanol, as it is readily available and has a BP of 78...

Homework Statement If a steam engine operates at half of its theoretical maximum efficiency (emax) and does work at a rate of W J/s, calculate how much heat is discharged per second. Homework Equations WMax = \epsilon_{Max}*Q_{H} W = QH-QC The Attempt at a Solution W =...

Hi I am working on gas turbine design to investigate fatigue and creep failure and i want to design gas turbine blades for aircraft engine. I need to find out the dimention for CAd design if anyone help me that what should be the dimention of these blades and how many blades attached to...

Hello this is my first post on the forum, i have very little knowledge in physics and high level mathematics, but for the past few years I've been dabbling with excel on a way to compare and give rough estimates of many facets of engines. At the moment what I am working on is determining the...

I have spent a while trying to work out a simple equation to give me the driving force of the engine in a car using the inputs: Power, wheel radius and rpm but when I put in real numbers from a production car, I get low values of 2197N. The equation I have derived is: Driving force =...

Homework Statement A Carnot Engine operating between 900 Fahrenheit and 90 Fahrenheit produces 40,000 ft-lb of work. Determine (a) the heat supplied, (b) the change in entropy during heat rejection and (c) the thermal efficiency of engine. (answers should be in BTU) Homework Equations What...

With Heat exchanger, Exhaust Calorimeter (water and gas) temperatures along with dynometer readings for each temperature reading, is it possible to calculate the pressure coefficient of the engine? If so, what formula would be required?

Does anyone know the proper way to do this?

hi how to find air mass flow rate in jet engine? we are using thrust/Isp equation to find the mass flow rate for rocket equation. is that any formula available for finding the mass flow rate in jet engine

I currently doing by final project about designing fan for turbofan engine.After discussing with my lecturer,I decided to do it based on axial compressor preliminary design method in Gas Turbine Theory : G. F. C. Rogers, H. I. H. Saravanamuttoo, Henry Cohen book.Now after following the design...

Hi, I have this question that, how do we calculate the distance an IC engine can propel a vehicle for given certain conditions? And what would be those required certain conditions? As a test case, i was looking at this engine: http://www.yanmar.com.au/industrial/la_series/l48ae.htm...

HI In Jet Engine, i want to know that the compressed air prssure changes before it enters into the combustion chamber from the compressor in various altitude and velocity or it is consatnt for altitude and velocity?

I have to derive an equation that determines the stagnation temperature at the turbine inlet for a turbofan engine, from some data that was measured during an experiment. The data I have: engine RPM Exhaust stagnation temperature fuel consumption thrust To=16C Po=101kPa I have...

Homework Statement The pistons of a 4 cylinder car engine when idling move approx. in SHM with an Amplitude of 50mm and at a frequency of 110Hz.Calculate *the max speed of the pistons. *max acceleration of the pistons. Homework Equations max velocity = A(omega),max acceleration...

Hi all, got a little physics problem that I wonder if anyone could help me with. I'm using an accelerometer to record the rate of acceleration of a vehicle over time (1500kg). With this data I am calculating speed and distance traveled over time. I'm now trying to figure out a way to calculate...

Seems like a stupid question, to me. But well, I am stupid aswell, so it fits me. Its something I've been thinking about lately. How is the heat/buring of the fuel transformed into mechanical work? I've had some ideas but they are mainly stupid and the loss of energy would be massive in...

Homework Statement A diesel engine which drives a generator has an output of 60 hp operating at a n=31%. Then generator has a n=79% and supploes a load circuit at 240 V. The diesel engine uses light fuel oil (LFO) with a calorific value of 19,600 BTU/lb. Calculate: 1. The generator...

Dear Sirs; I have an engine design project that I am working on. Once I have calculated the mass of the moving parts, i.e., piston, crankshaft. etc., I need to find the equations and the related information to be able to calculate the power necessary to drive it. Can anybody direct me to a...

Homework Statement A jet engine is being tested in the laboratory and it is found to consume 20 kg of air per second while using 0.2 kg of fuel per second. Given that the exit velocity of the gases is 500 m s-1, calculate the thrust generated by the engine. Homework Equations F = M(V-U)...

Hi! I am wondering if anyone here knows of a generic heat engine simulator. I.e. something that can simulate the behavior of reciprocating engines, Stirling engines, and so forth. The outputs I'm interested in include things like power and efficiency. The input variables that I would play...

"Acceleration increased during S-IC flight for two reasons: decreasing propellant mass; and increasing thrust as F-1 engine efficiency improved in the thinner air at altitude." This is from Wikipedia, so who knows. Why would a thiner atmosphere increase the thrust efficency of the engine...

Hello, Currently I work as a retail store manager, a career that I find tolerable but I do not love. I have always been interested in math, physics and mechanics, however recently this interest has grown as I have been doing a full engine rebuild on my race bike. I have realized that working on...

What is the Air/Propane mixture Ratio? The Fuel Air Ratio of a Jet Engine is 15 to 1. This is for JP4. What is the Fuel Air Ratio for Propane Gas? I have learned the only difference between a rocket engine and pulse jet engine is the pulse jet runs on the oxygen that is in the air (30%...

I have this problem and it seems like it has a simple solution, however I can't seem to figure it out. Using the following values and the previous equation calculate the rate of climb for a typical airplane at an altitude of 8000m. 4 Engines each with 150kN of thrust. Aircraft mass is...

Homework Statement A heat engine uses a diatomic gas that follows the pV cycle shown in Figure. Part 2→3 is adiabat, part 3→1 is isotherm, V=1040 cm3, P=100 kPa, T1=212 K. Determine the pressure at point 2. Determine the volume at point 2. Determine the temperature at point...

I am interested in the fluid dynamics of a turbine engine that compresses its exhaust gasses along its centerline. http://www.faqs.org/patents/app/20090067983 Any thoughts?

If you were to design a pulse jet engine where would you start? How do you determine the diameter and length of the tail pipe? How do you determine the diameter and length of the combustion chamber? How do you determine the area of the air intake valve system? How do you determine...