Engine Definition and 999 Threads

Hello to you all, Does anyone know if gas engines running on a cogeneration (combined heat & power) mode can achieve electrical efficiency rates as high as 40% as it is...

Can anyone here explain to me the concept of an Alfvén engine? I heard about it sometime ago in a science fiction book and I have found little on the internet regarding it except enough for me to know it has something to do with interstellar magnetic fields (hence why I am posting here...

Hi, Can someone please solve this question for me, including step by step instructions ? I can solve the ones where the mass of a car is given, but can't do this one. Homework Statement Setting off from rest the car accelerates uniformly and climbs a steep hill which has a gradient of 1...

Hey there, I am trying to model engine combustion dynamics on MatLab using basic physical laws. My code starts bugging just at the start of the Power Stroke. The pressure value shoots off to 60 bars right at the start. I tried narrowing down the error and I think i have a problem...

Hi, I am working on a school design team where we are building a small scale formula car. I am a member of the engine group, and am tasked with CALCULATING the minimum spark energy required to start combustion in our engine. I know there is an official term for this, (required spark energy?)...

Homework Statement A 1500kW heat engine operates at 25% efficiency. The heat energy expelled at the low temperature is absorbed by a stream of water that enters the cooling coils at 20 degrees C. If 60L flows across the coils per second, determine the increase in temperature of the water...

Hello friends, I just wanted to know what makes the engine turns faster when you open the valve throttle.

The power output of an automobile engine is directly proportional to the mass of air that can be forced into the volume of the engine's cylinders to react chemically with gasoline. Many cars have a turbocharger which compresses the air before it enters the engine, giving a greater mass of air...

The Govt. Surplus GenSet engine A084 is a four cylinder, four stroke, 1390cc/84cu.in. aircooled flat four with a 3 in. bore and a 3 in. stroke. It was made by the thousands by Hercules and resembles a Lycoming shrunk in the dryer. It has been converted to experimental aircraft use and faily...

If human can build the starship but how there having a drive engine system that have a more reliable and infinite source of fuel?

Homework Statement Several velocities, time, and length scales are useful in understanding what goes on inside engines. Make estimates of the following quantities for a 1.6-liter displacement four-cylinder spark-ignition engine, operating at wide-open throttle at 2500 rev/min. a. The mean...

hello fellow engineers! i just started work at a marine company and was assigned to investigate on this formula. it is from ISO 8861 and used to caculate the airflow needed for heat evacuation in a engine room. this is the formula, airflow needed = (heat emitted from engine and all other...

Hi, I have had an idea floating around regarding stirling engines, and was hoping that somone may be able to provide some information. Supposing a stirling engine is run mechanically, one side heats up, the other cools down. what would happen if the cool side was heated externally...

A friend and I are working on this idea which is fairly common, but I'm having trouble starting out. The idea is that of a compressed air engine. Where we take a normal, small capacity engine and modify it such that only compressed air, stored in tanks is sufficient to move the piston. Now...

Hello, I'm in the process of building a small liquid rocket engine that uses glow fuel as propellant. Can anyone direct me to a company that sells small liquid rocket engines? Thank you.

This is a simple question I have because I am looking at a particular engine cycle, and I can't seem to think of its name...thus it is very difficult to search for discussions of something you don't know the name of. I'll describe the cycle, if anyone knows the name of the cycle please let me...

I found this engine amoung the many on the web from inventors out there. Essentially this person adapted a can combustor onto an inline cylinder engine with turbos. Below I pasted the description from the site. What are your thoughts on this one...

I am not talking about just ICE, but any thing that converts matter to energy.

Homework Statement [PLAIN]http://img15.imageshack.us/img15/7379/unledtzc.png (The rods are of length L, there is no friction, massless rods, yadee yadee yada) At a certain angular speed \omega, the counterweight performs uniform circular motion. Show that \omega and \theta are related as...

I wanted to know that what exactly is Knocking in an engine cylinder. I know it's a kind of a fault. But how and whole process leading to it is, what i want to know. Any reply will be well appreciated. :D Yash

This is my first posting with the forum and I hope I have chosen the appropriate topic. I am a 25 year automotive technician and have been pursuing an alternative application for the automotive industry. It is the electromagnetic pulse engine, which basically utilizes a regular 4 cylinder...

The theorized Alcubierre engine is purported to be capable of transporting a ship faster than the speed of light. I'm aware of the theory's problems associated with how much energy would be required to operate such an engine. This isn't my question. Apparently gravity waves, waves in the...

Is it possible for engines to be completely balanced?well I recently saw an engine manufacturing facility where crankshafts were machined , balanced and then assembled ,hence when the engine finally comes out can it be called a completely balanced engine?

hello! My first post here. I am by no means a mechanical engineer as I studied computer science in college. My question has to do with adding what is known as a cold air intake onto my vehicle. The design of the intake is such that the pipe fits at the throttle body via a silicone/rubber...

Hello everyone outhere. Newbie here, I'm senthuran, I'm a 3rd year B.Tech Mechanical Engineering student at Dr.M.G.R university in chennai south India. My project comes up in my 8th semester. I underwent a 15 day inplant training at BMW assembly plant in chennai. I spoke to a few people there...

this is a small pulsejet designed by me..it produces around 2pounds thrust..This is the cheapest pulsejet engine you could make it costs around Rs.50..i will post the video tomorrow because i forgot to take my cellphone with me..But here is the engine pictures. here is the plan.. here is the...

I'd like to first say that I'm not really sure which forum this is supposed to belong in. This one seems to fit best, but my question may be better in one of the math/physics forums... I'm planning on going through the resources Chris Hecker recommends in his article Physics References...

This occurred to me when I first heard of the Space Time Frame Drag effect, which was confirmed by the results of Gravity Probe B (GP-B). http://science.nasa.gov/science-news/science-at-nasa/2011/04may_epic/" I am not a scientist or a mathematician, so I turn to my fellow humans who are. Do...

I’ve been searching high and low for an answer to this question. What actually HAPPENS if two engines were to power one drive shaft? I heard back in the days that cars were built this way to break speed records, and I heard present day it is used in tractors, but what increase. My question...

Using the TRITON engine, assuming it worked, starting from low Earth orbit about how long would it take to get to mars?EDIT: The Triton is a nuclear thermal rocket design, but I can't seem to find too much info about it.

Hi, I'm looking for some good books on engine building or modification. Any suggestions or preferences would be appreciated.

I wanted some help in finding out the time taken for a differential mass of gasoline being burnt in the cylinder during the power stroke. Also, does it depend on the residual temperature of the mixture? I tried to find it out through Arrhenius equations but am having a problem finding out...

Homework Statement A 6 cylinder engine has cylinders wirh a bore of 115mm and a stroke of 145mm Each cylinder also has a clearance volume of 300 cubic centimeter. This engine operates on a four stroke ideal otto cycle and at 3000 rpm. The temperature and pressure of the intake air is 25...

Homework Statement 8. A house is cooled by an air conditioner. The outside temperature is 32°C and the inside temperature is 21°C. The heat leakage into the house is 9000 kcal/hr. If the air conditioner has the efficiency of a Carnot engine, what is the mechanical power required to keep the...

What are the uses of mineral oils and self contained lubrication system in internal combustion engine? Please answer fast Its urgent

I am looking for something on the lines of this - http://www.tineye.com/ . i.e a site where one uploads an image and it gives back similar images from other websites. (note - I am not asking for face recognition or similar thing , that I guess would be a big demand . I just wanted to find...

Homework Statement What is the maximum effciency of a heat engine whose operating tempuratures are 550oC and 365oC? Homework EquationsE=1-Thot/Tcold The Attempt at a SolutionPLEASE HELP! My thinking is that the effciency is equal two one minus the temperature in the hot resavour...

hi this is my first post on here so please be gentle. my names chris and I am an aerospace engineering student and i would like to build a jet engine based around a turbo charger, i know this concept isn't new but its something i would like to build. I am on a tight budget so i need to build...

Homework Statement Find the constant Torque being applied. We are given a diagram of a piston engine, along with the masses of piston, flywheel and rod connecting the two. I know that the expanding gas in the piston does 4 kJ of work. I know that at the beginning of each rotation the engine...

Ok, so I am working on a project for the summer that involves building a robot-like RC car/atv (for off-road). I want to figure out the cheapest way to get an engine that will output 1hp (which I am pretty sure is pretty close to 36 VDC, correct me if I am wrong though). Is there a way to...

Homework Statement The major difference between a jet engine and a rocket engine is that a rocket carries its own oxidizer, usually in the form of liquid oxygen (LOX). A jet takes in air from the atmosphere as it moves, uses it to burn the fuel, and then ejects all the gases out the back...

how does salt turned into an engine affect?

Homework Statement Calculate the Power, Efficiency, air to fuel ratio. torque-3.809Nm speed-3137.207 l/min T1 Temperature Exhaust=412.598degC T2 Temperature Ambient=19.141degC T3 Temperature Fuel=18.994degC dv/dt Volumetric Flow Air=109.954 l/min p fuel Fuel Pressure= 21.475 mbar...

Homework Statement A thermodynamic engine is operated between two cooler bodies A and B, extracting work until the two cooler bodies reach a common temperature T_f. This work is then used as the input to a heat pump, extracting heat from the cooler pair and heating the hot body C. Find the...

For a Science Expo project I will be converting a small engine to run off hydrogen. I have in mind a cheap four stroke water pump. My father said he is willing to let us use...

I've just finished some past exam papers and when marking them using the mark scheme something confused me a little One question said when a fire engine moves away from an observer, the pitch of the siren decreased, why and I chose the wavelength of the sound wave decreases The mark scheme...

Hi..can u please tell me the meaning of Idling of an engine...?

Let's say we have a room in which it is around 20° C and at normal pressure. There is a substance that is a liquid, but when the temperature increases to 25° C or so, it rapidly expands, whether that is by boiling (conversion to gas), or just by expanding as a liquid. First question: does...

Homework Statement the gear ratio between crankshaft and driveshaft calculates to be 13.579 at first gear the diameter of the car wheel is 0.6m the transmission efficiency is 0.85 weight of the car is 1200kg if the engineer is running at 1500rpm how do you calculate the speed in...

Hi! I have a question about how thrust is made from a turbojet engine. The most common explanation goes something like "As the fluid gets accelerated there is a net force". I don't think this explanation is either good nor rigorous. The force that accelerates the fluid is, of course, the...