Engine Definition and 999 Threads

low bypass ratio engine has low mas flow and high speed, high bypass ratio engine has high mass flow and low average speed. if the high bypass ratio engine has high mass flow and high average speed, what are the advantages and disadvantages of this jet engine?

It does not sound bad, does not It??. Using the residual heat it would be possible to power a Stirling engine, producing energy to be stored in the battery. Getting less power from the gas engine, (less time alternator running), less gas used, higher efficiency. How does it sound??

Does a jet engine have a life span?

I'm currently doing a project on neural network controller for an internal combustion engine to reduce emissions level. Can anyone assist me in training such models (neural networks)

Hello guys, I really don't know much about cars at all. So here is my question 1. If I keep driving and turn off the key the car continues to run? Is this because momentum. Would the car eventually stop due to friction? I mean if spark plug stops working how can the car continue to run...

HI, my friends Lets imagine a car engine combustion chamber which is fed with an estequiometric fuel mixture (gasoline+air) with a 1mm plug gap. Is there an aproximate algorithm to solve out what voltage is needed to create a spark, based on gas pressure and temperature?. I don't want...

Homework Statement Two heat engines operating on Carnot cycles are arranged in series. The first engine A receives heat at 927 deg C and rejects heat to a reservoir at a temperature T. The second engine B receives the heat rejected by the first engine, and in turn rejects heat to a reservoir...

Homework Statement I need some help with this problem: A model Stirling engine uses n = 7.44 × 10–3 mol of gas (assumed to be ideal) as a working substance. It operates between a high temperature reservoir at TH= 95.0°C and a low temperature reservoir at Tc = 24.0°C. The volume of its...

Hello, For a given vehicle, I want to use a given chart for engine torque vs. engine speed (or hp vs. engine speed) and convert it to an approximate 'applied linear force' on the car (assuming no wheel slippage). I need a very rough approximation, so I've averaged the engine torque and...

How to prevent engine overrun? Is there any relation between overdrive transmission and engine overrunn? Pl. clarify?

hello! i have calculated an engine power of a prototype car by calculating the power losses against road gradients, air drag and rolling resistance. i have calculated these losses for max. car speed,lets say 50 kmph. what i need to know is do i need to consider acceleration allowance even when...

Hos is the force from a Otto engine (petrol engine) transferred from the engine to the wheels so that the car can move? I would like a short sceintific description, thanks :-)

You can now search for Tienanmen Square Massacre in China. Wonder how long it will last. http://news.bbc.co.uk/2/hi/business/8581393.stm Nice comeback. I love google.

I'm working on a really important physics assignment and i am in deperate need of help! I need to find some scientific problems with reference to the first petrol engine and the some of the first cars ever made (1887-1912). I have to present some problems which i am to solve later on. The...

Homework Statement A heat pump takes heat from a hot resevoir and dissipates heat to a cold one. Both resevoirs are equal mass and specific heat capacity. Show that as the heat engine does maximal work the final temp of the resevoirs = Tf = SQRT(TcTh) Homework Equations Qin = Wout +...

Hello! Actually i want to find the required power of an a single cylinder air cooled 4 stroke OHV engine. i have calculated three power losses, power loss against road gradient (Pg), rolling resistance (Pr) and drag (Pd) using the following formulae: Pg=M*g*v*grad=1.095 hp M(mass of the...

Okay, so I've found this site (http://www.spiritofmaat.com/archive/feb2/carplans_doc.htm) and it claims to have a reliable method to convert a diesel engine to run off of hydrogen. Now, my question is is this actually feasible in the method they've described? I've asked two other sources and so...

Homework Statement The exhaust temperature of a Carnot heat engine is 401◦ C. What is the intake temperature if the efficiency of the engine is 40.2 %? Answer in units of ◦ C. Homework Equations e = 1 - Tc/Th (all in Kelvin) The Attempt at a Solution 0.402 = 1 - Tc/ (401+273) = 1...

Homework Statement A car with mass 1000 kg accelerates from 0 m/s to 40 m/s in 10.0 s. Ignoring air resistance. The engine has a 22% efficiency, which means that 22% of the thermal energy released by the burning gasoline is converted into mechanical energy. a) What is the average...

Homework Statement 21. A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during each cycle is 2800 J. What is the maximum possible work done by the engine in each cycle? (A) 1200 J (B) 1600 J (C) 2100 J (D) 2800 J (E) 4400 J I...

Hey, I am working on a project and yahoo answers hasn't been much help. I am building a light weight race truck and I was hoping someone in here had heard of a high horse power diesel engine that wasn't heavier then the rest of the truck :)

Homework Statement http://img291.imageshack.us/img291/7786/effx.jpg Homework Equations e=1-1/(V1/V2)^(gamma-1) The Attempt at a Solution This is a practice test where he gives the solutions, as you can see the first thing he asks for is the efficiency, and lists the answer as...

Homework Statement A Carnot engine working with a monatomic gas operating between two temps, 288K and 497K. The engine performs 800 J of net work. Homework Equations Q = nRT ln (V final/V initial) The Attempt at a Solution I don't have enough info for the above equation. I...

Homework Statement I=\frac{p_{ave}}{4\pi r^{2}} is derived on the assumption that the transmitting medium does not absorb energy. It is known that the absorption of sound in dry results in a decrease in energy of about 8 dB/km. The intensity of sound at a distance of 120 m from a jet engine is...

Ok so I'm no grad student asking for help on a research project. I'm a senior in high school that is totally burnt out when it comes to the daily grind. I think I found a project, that hopefully is possible, and that will take me oodles of time and feed my hunger for education without a stupid...

Homework Statement A Carnot engine has 40 g of helium gas as its working substance. It operates between two reservoirs of temperatures T1 = 400°C and T2 = 60°C. The initial volume of the gas is V1 = 2.0 X 10-2 m3, the volume after isothermal expansion is V2 = 4.0 X 10-2 m3, and the volume...

Homework Statement I'm trying to find the final temperature of a carnot engine with two finite thermal reservoirs. We're told that the heat capacities for both reservoirs are constant (and equal) and to regard the change in each reservoir's temperature during any 1 cycle as negligible...

Homework Statement An ideal Carnot engine operates between a heat reservoir and a block of ice of mass M. An external energy source maintains the reservoir at a constant temperature T_{h}. At time t=0 the ice is at its melting point T_{0}, but it is insulated from everything except the...

Homework Statement Assume that the speed of sound in the air is V=343m/s. Use the generalized form of the Doppler equation to solve the following problem. You are standing 100m away from a long straight road while a fire engine passes by along the road. The fire engine is equipped with a...

[b]1.A heat engine is rejecting 200btu/h and 30% efficient, how much power does it use in watts? [b]2. QH=w+QC and power=energy/time (1kwh=3412btu) and a power diagram: QC= wasted heat, w=work QH l 30%l---->W l QC [b]3. 200btu/h(1kwh/3412btu)(1000w/1kw)=58.6watts...

i have diagram of the turning moment in flywheel in internal combustion engine , i want to determine the mass of moment of inertia of the flywheel needed to keep speed fluctuation < or equal 1.5% at engine speed 560 rpm ? http://img534.imageshack.us/img534/1765/57306264.jpg

Homework Statement An ideal monatomic gas is confined to a cylindrical container having a movable, yet "snuggly-fitting," lid that slides up and down to accommodate changes in pressure and volume. The diagram shown below, outlines the steps in a heat cycle starting at position A and moving...

Homework Statement A car of mass 500 kg has a maximum speed of 40 ms-1 on a level road with the engine of the car working at a constant power of 20 kW. The resistance to motion is proportional to the square of the speed. (i) find its acceleration when the speed is 20 ms-1 (ii) find the...

Given : QH=W+QC and Power= E/t or W/t A heat engine is attached to a 200W lamp. If we power the lamp for 1 hour and extract 700 btu from the heat source, how much heat is rejected? Attempt: 200w(3.412btu/1w) = 682.4 btu now, 700 btu-682.4 btu =17.6 btu rejected??

Homework Statement The diagram below shows the thermodynamic cycle of a diesel engine. The compression ratio is the ratio of maximum to minimum volume; r=\frac{V_{1}}{V_{2}}. In addition, the so-called cutoff ratio is defined by r_{c} = \frac{V_{3}}{V_{2}}. Find an expression for the...

Hi, I'm not sure if I've got this in the right section, but I'm hoping someone can point me in the right direction. I'm trying to create a model of what's actually happening during the combustion cycle in an engine and where the energy is going. As the intake valve closes and the piston...

if i have calorific value of mixture, volume at time of compression, bore diameter, can i know the pressure being exerted on the pistons due to the combustion?

Note this is more of a coursework question about the theory behind Carnot engines as opposed to an actual homework question. Homework Statement The Attempt at a Solution So I am reading the theory behind a Carnot Engine and I am a little confused about the cooling stages of the Carnot cycle...

I got a small 16inch folding bike weight 13kgs and managed to shed it down to 9kg and working in weight reduction further... eg using hollow shaft at the peddle and using clips at the axles and replacing to 14inch rims and redoing the frame in lighter stainless 201 - these are my next to-do...

1. I have heard the argument that "the Effort ( Force ) required to move a certain mass by Pulling is greater than the Effort required to move the same mass by Pushing it". What is the truth regarding this statement and what causes the difference in the applied force to move the same...

Is 3 stroke engine possible??if not why?

Hi guys I read somewhere that "the actual torque transmitted from the engine to the clutch is the total engine torque subtacted by the amount of torque required to accelerate the inertia of rotating components of engine.i.e:" T(c) = T(e) - [ I(e) x \alpha(e) ] where T(c)=Torque at clutch...

I’m from a group that is current working on the theory of a Hydrogen Economy. Our first area of development is the Hydrogen Highway. We are currently seeking help in the form of freelance / work for hire basically engineer(s) that could aid in design and calculations of internal combustion...

Hello, I am currently doing a project on reciprocating compressed air engine and would like to have explanations about the mechanical design - is it similar to a reciprocating air compressor or steam engine, that is, does it have a conventional piston-cylinder assembly, connecting rod...

Hi, i am interested to know the major components of the fuel system of a car. I know, these are the major ones: Fuel Tank, Fuel Pump, Fuel Filter, Injector Valve, Return Lines but what i am interested is in the fuel system for (1) a single cylinder engine, (2) no carburetor (instead, i am...

suppose a bike which has 2 piston engine and other is 4 piston. which one is most powerful? thanks

Homework Statement 18. (II) At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate ehat input of the second. Th eoperating temeprautres of the first are 680 degrees C and 430 degrees C, and of the second 415 degrees C and 280 degrees C...

Im looking at designs for a engine, but I am giving myself a headache over something which is probably incredibly obvious. Ill explain it as simply as I can in text and I've drawn a (terrible) paint image to help explain it a bit better. There are two cylinders. One cylinder needs to have its...

Homework Statement A heat engine operating between 78.5oC and 204oC achieves 20.6% of the maximum possible efficiency. What energy input will enable the engine to perform 10.2 kJ of work? The only help I need with this is exactly what equation(s) to use. I would think thermal efficiency...

So, I've been working on an engine design that has been tried already, and nobody has really got it to work the way i think that it should. The engine I'm working with is a Wankel Rotary Engine and what I'm trying to do is make a modern, high-efficiency, high power-output diesel out of it. I'm...