Engines Definition and 291 Threads

hi.. I am new to this site. I want to know about reasons of failure of connecting rod of 4 stroke petrol engine. In this case the rod has broken into two parts from the small end of the rod. The manufacturing root of the component is hot forging - hardening - induction softening of the small...

Can anyone help me? I'm doing a question on aircraft propulsion technology and I'm stuck. The question is: 'If the mass of air through a propeller is 1000 Kg/s, the aircraft's velocity is 100 m/s and the slipstream velocity is 120 m/s, calculate the thrust? Attempt at answer...

hello, My name is vinod, I am student and currently I am doing a project on developments in turbofan engines. I want to know the developments taking place in the turbofan engines with respect to efficiency and noise. Also, I want to know more about propfan (unducted turbofan) engines, can...

There is a temperature difference and we know the transition of the working fluid (from the hot chamber to the cold one) is isometric. So either there must be a pressure difference, or the number of molecules must be smaller; however, this can't be the case since eventually all the gas must move...

Homework Statement The object of this assignment is to find two engines that have the same displacement and different number of cylinders and compare ratio of their power output to a few equations' results. The engines should be from the same manufacturer and their manufacturing date should...

even though the thermal efficiency of diesel engine is more than that of gasoline engine , why is it that gasoline is preferred over diesel for cars?

As i have read in several articles, it is obvious that short-stroke or oversquare engines can rev higher and produce more power and less torque and usually used in sports cars but long-stroke engines are good for high low end torque and can't rev as high as short-stroke engines. But i have...

This question has been in the back of my mind for a while. In short, is having a phase change between liquid and vapor more desirable for a heat engine or for a heat pump? Clearly, having a large area enclosed by the loop in a P-V diagram increased the amount of work in the cycle, so...

Where should I post questions about how to make a DIY Stirling Engine work?

I have been searching for explanations and formulas on this subject but have been hard pressed to find what I am looking for unfortunately. I would be appreciative if anyone could either provide some answers or any external resources they could point me to which has detailed information on this...

My question involves heat engines. I understand that a heat engine typically uses energy provided in the form of heat to do work. According to the 2nd law of thermodynamics, however, not all heat energy can be converted into work energy, meaning that heat engines are not perfect. At least some...

Please can someone explain clearly in perhaps lay man terms the difference between REVERSIBLE & NON REVERSIBLE INTERNAL COMBUSTION ENGINES. Thanks

The Attempt at a Solution For a) I imagine it is easier to control the temperature of the hot reservoir because you could use a constant heat source e.g. bunsen burner. c) melting/freezing water. d) Entropy of the environment increases and the entropy of the universe always increases...

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...

why jet engines are attached to the wings of the airplane ,not other part?:confused:

can someone tell me what temperatures ic engines generally operate at?

i read that motors can be operated by interfacing them with micoprocessors(stepper motor),so can this be done with modern day engines?

Hello all, I am an amateur science fiction writer and am currently working on a novel. I am exploring the possibility of deuterium engines and am having a bit of a difficult time understanding some of the research that I have been coming across, as I do not have a very large science background...

Hello all, I am an amateur science fiction writer and am currently working on a novel. I am exploring the possibility of deuterium engines and am having a bit of a difficult time understanding some of the research that I have been coming across, as I do not have a very large science...

So I wrote my Thermodynamics final today and one of the questions were as follows: A reversible heat engine supplies a reversible heat pump. Both draw off of a temperature reservoir T (can't remember the exact value, but there was one). The heat engine discharges heat into TL, and the heat...

Hey Guys, I'm trying to solve the problem below: Steam enters a turbine with a velocity 120 m/s at 600°C and 600kPa. The steam leaves the turbine as saturated vapor at 200 kPa with a velocity of 180 m/s. Heat is transferred from the turbine to the surroundings in the amount of 30 kJ for...

Just looking for a place to start researching. Say I wanted to make an educational MMORPG. No need to reinvent the wheel; there are games out there that could be modified. Do gaming companies have a model where they license their gaming engine out to be redeveloped and modified?

What is the advantage of a big V engine over a V-twin engine? Why not just use extra-large V-twin engines instead of using V-12 engines and such?

Homework Statement Hi there Rocket has a total mass of 3.4 x 10^6 kg at lift-off. The first stage contains 2.0 x 10^6 kg of propellants which is consumed at a rate of 1.4 x 10^4 kg s Find the minimum thrust of the engines at lift-off? I would have thought that you needed one more...

How are jet engines cooled? I've seen diagrams of all different kinds of jet engines and I cannot find anything which resembles a cooling mechanism.

1. There are two parts to this problem. I'm having trouble with the second part, but I'll include the first part as well since it's probably needed for the second part. Part 1: "A building is cooled by a Carnot engine operated in reverse (a Carnot refrigerator). The outside temperature is...

I'm troubled by the problem of pumping fuel to a combustion chamber. The big problem is that pressure cannot be directed in some particular direction. So when you see propellant leaving the chamber with a great pressure, it should be kept in mind that the propellant is attempting to leak, with...

Hi guys What would be advantage of a V-8 6.0L over V-12 6.0L. Or any disadvantage! Will it be more speed, smoothness or what?

I know that a lot of plane crashes were caused by birds being sucked into an engine (e.g. the Hudson River Landing). Is there a way around the problem? I know that no solution is out there so what are some things that's stopping it?

I am starting this for a couple reasons. First is that I wanted to post a link to a tech article on Smokey Yunicks engine. Popular mechanics article on good, old, google books, search: smokeys engine. link below (hope it works)...

What Basis Bypass Ratio Has Chosen For Turbofan Engine

Well I want to become an AE but want to know what it entails first. I want to focus mainly on Jet engines and propulsion systems mostly but if I have no real idea what that means or what it involves so can someone explain this to me? I think it means me and a group go out design,build and...

I've always been fascinated by and wanted to know more about the internals of a car: everything from the engine to the transmission to the suspension and the chassis. Currently I am a year 1 ME student, so I don't have enough physics knowledge to study the logistics in depth in that regard...

Dear all, I am so sorry for my stupid questions. Currently, I am looking for documents (lecture notes) on tubes assembly and manifold for aircraft engine. What are those tubes assembly and manifold? What are those characteristic? I did quite a lot google search, however, I only found any good...

This inquiry is in relation to internal combustion engines. I am trying to figure out how to maximize the mass of air going into my engine. Because the more air that can get into the cylinder, the more power the motor can make. Now I've been researching Bernoulli's Principle and as I understand...

1. What is the thermal efficiency for the heat engine shown in the figure? What is the heat extracted from the hot reservoir for the heat engine shown in the figure?t Figure shown here: 2.Wout = 1/2 B*H Also, Qc=Qh-Wout, efficiency: Wout/Qh 3. Wout = .5 * 200KPA*...

the diesel cooling engines as produced by deutz have huge fans to deliver substantial amounts of air to the engine. they draw a lot of power from the engine. is it possible to use a mesh of delaval valves like a radiator that drops the temperature of passing air, thus, reducing the amount of air...

A steam engine stove produces, say, 10 units of warmth, the second law states that not all warmth can be converted into work, so 8 units are converted into orderly energy, work, and 2 units aren't converted. Why did the entropy increase, since 10 units of warmth is more chaotic than 2? A...

At higher altitudes in the atmosphere, why do aircrafts (particularly fighter aircrafts) with jet engines leaves some kind of white cloud trailing behind? It doesn't disappear for a reasonable amount of time. What is this? Thanks!

how do toroidal engines get lubricated?

hello i'm a first year student of mech eng...although its embarassing to admit, but i actually do not understand how a double acting steam engine functions. more specifically, i don't understand the inner-mechanism of the return-stroke. how does the piston come back to the top dead centre? is...

Is there any circular engine (or any engine in general) which exhibits almost full time combustion? Leave alone turbine engines...that's too much of a hassle when implemented on automobiles (or is it?). Nope...no propulsion systems (like ramjet).

I was just thinking about replacing an engine with a motor in my genset but can't find the right match. It would be really great if someone can shed some light on the rationale btw. the two. How's the engines capacity rated and which motor capacity would be equivalent to a particular engine...

Could a 10 HP diesel engine be made as fuel efficient as say a 100 HP diesel engine, that is (work done/fuel used). Does thermodynamics prevent a smaller engine from being more efficient? Thank you for your time.

I am sure someone wrote with great detail on the subject, but i just can't seem to find it in the forums... I want to know about the parameters influencing the performance of an IC engine...obviously, not all parameters, but those we can conviently control specifically...how is bore/stroke...

quick question, is the difference between a carnot engine to an engine is that the engines eff is less than or equal 1-(cold temp / hot temp), and the carnot is the max of this which is just equal 1-(cold temp / hot temp)?

The enthalpy of formation of methanol (-22.7 KJ/g) is about half that of octane (-47.8 KJ/g). But methanol allows an ICE engine to achieve much greater specific powers than a comparable gasoline engine. My RC heli runs on methanol and will outperform any gas powered heli. But why is this? I...

I came across another good search engine today looking for a datasheet, so I thought I'd try starting this thread for folks to post useful links. The links should be to technical content, and not to paid services. Good free datasheet search engine: http://www.datasheetpro.com/ Good way to...

Can pure oxygen be used in internal combusion gas or diesel engines? If no, what percentage could be used?

Hey all, This is a simple question: Lets say we have a solid hot-body in outer-space that's emitting thermal radiation. Assuming that it doesn't sublimate, will it simply radiate black-body radiation until it reaches absolute zero? This doesn't sound right. Thanks