Engine Definition and 999 Threads

We have a carnot engine with Th = 800 degrees Celsius, and Tc = 50 degrees Celsius. This produces a work which is drives a carnot heat pump which has heat reservoirs at Th' = 50 degrees celsius and Tc' = 0 degress Celsius. What is the ratio of heat absorbed by the Heat Engine to the heat...

Two bodies have the same Internal Energy. (U = N C T) Both N and C are the same for each of these bodies. The initial Temperatures of these bodies are T1i and T2i Using these bodies to produce work from a Carnot Heat Engine, they are brought to a final temperature Tf. What is this final...

Has anyone here looked at the physics of stellar engines? See http://en.wikipedia.org/wiki/Stellar_engine for an overview. In particular, I have done a simple calculation for the acceleration due to light pressure of a "Shkadov thruster", which is a reflective shell on one side of a star that...

Actually, we have three spool, two spool engine and single spool engines, how about the four spool engine? did anyone came across the design of four spool engine? I think adding an extra spool leads to increase in engine weight and becomes more complex in its mechanism.

Homework Statement A heat engine operates in a reversible cycle with the following steps: (i) An ideal gas characterized by γ = 1.4 expands adiabatically, so that it cools from an initial temperature of 330°C to 30°C. (ii) It is compressed isothermally until it reaches its initial volume...

I am an engineer but have a rather dumb question regarding superchargers for engines and probably compressors in general. Most specifications are give as XXcfm at XX psi. I am trying to understand if this truly means we are moving that amount of air at the rated psi or if that means that...

I was thinking the other day about a possible hybrid conversion vehicle that could store braking energy as compressed air. The setup is like this: The engine valves are all electric solenoid controlled. When the motor is running on gasoline it run like any other 4-stroke IC engine. There is...

Homework Statement You want to boil a pot of water at 20C by heating it to 100C. I suggest a way of heating the pot in a reversible manner: simply inserting a Carnot engine between the reservoir (at 100C) and the pot. The Carnot engine operates between two temperatures, absorbing heat dQ_1...

Homework Statement A possible ideal gas cycle operates as follows: (i) From an initial state (p_1,V_1), the gas is cooled at constant pressure to (p_1,V_2); (ii) the gas is heated at constant volume to (p_2,V_2); (iii) the gas expands adiabatically back to (p_1,V_1). Assuming...

I know all procees of cfm 56 -3 . how its work and everything but i am not understanding starting system of cfm56 - 3. cfm 56 -3 has two shaft n1 and n2 . N1 is coneected with low pressure compressor , lp turbine and connected with fan . N2 shaft is coneected with hp turbine and hp...

i want to calculate the torque vs crank angle for wankel engine...however i get stuck on entering the pressure value which is p1,p2,p3...how can i determine the pressure value?

Homework Statement What is the relationship between the heat absorbed and rejected by the reservoirs and their temperature. If a heat pump is used to transfer heat what is the rate at which heat is added to the hot reservoir in terms of the temperatures of the reservoir and the work done by...

Homework Statement Using the conversion rate of [SIZE="5"]4.19 joules per calorie, how much energy is necessary to heat [SIZE="5"]2.50 liters (2500 grams) of water in a steam engine from [SIZE="5"]100 Celsius Degrees to [SIZE="5"]250 Celsius Degrees? Homework Equations ? The Attempt...

Homework Statement (a.) For an Ideal Gas Carnot engine, what is the relationship between heat absorbed and rejected by the reservoirs and their temperature? If a heat pump is used to transfer this heat, what is the rate at which heat is added to the hot reservoir in terms of the temperatures of...

Homework Statement A vehicle engine has a power output of 6.2 KW and uses fuel which releases 45 MJ per kilogram when burned. At a speed of 30ms ^-1 on a level road, the fuel usage of the vehicle is 18km per kilogram. Calculate: the useful energy supplied by the engine in this time...

i have a groub project which am facing lots of problems with it as am a girl and my knowladge in cars and engins very poor we are trying to improve a sump system in a formula one car engine (yamaha r6 bsl 600cc) the group has already decided not to use an oil cooler in the system and mu...

Hello. I have a question about a theoretical heat engine I recently encountered in my coursework: The setup is two chambers, one with more moles of a gas than the other, separated by a heat-conducting barrier. The right chamber has a small piston attached to it and is at a lower temperature...

Homework Statement 1. A heat engine operating between 200°C and 80.0°C achieves 20.0% of the maximum possible efficiency. What energy input will enable the engine to perform 10.0 kJ of work? Homework Equations e =1- Tc/Th W=e*Qh The Attempt at a Solution I got the answer but I...

Is it true that a car has it's best fuel consumption in max torque RPM? For example, if a car produces it's max torque in 4500 RPM, does it use the least amount of fuel by driving constantly in 4500 RPM?

Homework Statement A 200 litre container of boiling water and a 200 litre container of ice cold water are used as heat source and sink for a Carnot engine. Calculate the maximum amount of useful work that can be obtained from the system and the final temperature of the two containers of...

Homework Statement Determine which gives the higher efficiency of a Carnot engine, increasing the temperature of the hot reservoir, or decreasing the temperature of the cold reservoir by the same amount. Justify your answer carefully. Homework Equations (TH-TC)/TH)The Attempt at a Solution By...

Does anyone know what stirling engine could be used to power a generator which in turn powers an electric motor? I am thinking of using this concept in a vehicle. A diagram is here: It shows a metal sphere in vacuum sealed container. It would be connected to by a retractable contact...

My friends (all A&P Aircraft mechanics) say I'm nuts. A co-worker and I attended a Honneywell TFE731 jet engine maintenance school. During the class the instructor asked this question, "which side of the front fan on a TFE731 engine has the highest pressure?" His answer was the front. (we are...

Homework Statement The hot reservoir of a heat engine is steam at 100 Celsius while the cold reservoir is ice at 0Celsius In 1.4 hours of operation, 12 kg of steam condenses and 60 kg of ice melts. What is the power output of the heat engine? Homework Equations Efficiency =...

Hey people I intend to self learn IC engines. I am a a little confused by what this sentence says in my textbook. "An idling engine is one which operates at no load and with nearly closed throttle" I basically want to know what loading means in this particular context? And what else can...

Homework Statement A rocket is launched at an angle of 58.0° above the horizontal with an initial speed of 98 m/s. It moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time its engines fail and the rocket proceeds to move as a free body. Maximum...

So I'm looking and researching to build a small liquid-fueled rocket engine. So far I think my choice for fuel is definitely unleaded gasoline because of it's high impulse when mixed with Gas-state O2 and how easy it is to obtain. Previously, I was looking at using Hydrogen Peroxide (H202) for...

Hi. Im trying to measure the efficiency of a heat engine. I therefore need to work out what the input energy is to the heat engine. I have two problems. Firstly, how should I measure the heat going into the stirling rather than the heat coming out of the heater. Is it ok to measure the...

Homework Statement The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.33 rad/s2. It accelerates for 23.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 67.3 s after it begins...

Homework Statement A house is heated by means of a carnot engine operating in reverse (Heat Pump). The outside Temperature (Tc) is 270k, and the required inside temperature (Th) is 300k. If heating the house to this temperature normally requires 10kW of electrical heating, how much power is...

I am trying to design a low cost solar/steam engine for deployment where clean water and electricity are scarce. The prototyping I am currently doing is being done using plywood and a CNC router (mainly because that is what I have at my disposal). This will almost certainty not work as an end...

Homework Statement Rank these engines on the basis of their designed power output and their thermal efficiency. 1) Qin = 3000 J, Qout = 1500 J, f=150 Hz. 2) Qin = 4000 J, Qout = 3000 J, f=50 Hz. 3) Qin = 1000 J, Qout = 200 J, f=200 Hz. 4) Qin = 2000 J, Qout = 500 J, f=50 Hz. 5) Qin...

Just wondering if an idea I've had for a few years would actually work. If I had an engine where compression took place externally and the engine was only used for combustion for example. This engine would be direct injected. The fuel would be injected a very high pressures (common rail)...

http://www.google.com/hostednews/canadianpress/article/ALeqM5glnWkF4OYX0NZkxYhONr04DXvNOQ?docId=5045790 Two in two days? That seems unlikely.

Homework Statement The hot reservoir of a heat engine is steam at 100^ C while the cold reservoir is ice at 0 C. In 1.3 hr of operation, 11 kg of steam condenses and 52 kg of ice melts. Homework Equations I think power output is W=Qin-Qout The Attempt at a Solution I believe the...

Trying to get a link that works. http://news.google.com/?hl=en-GB Qantas grounds A380s after engine blast The Australian - Steve Creedy, Peter Alford - ‎1 hour ago‎ Firefighters surround the Qantas superjumbo after it made an emergency landing at Changi airport in Singapore following an...

What are all the given aspects of this? I understand how the reaction happens, but what about it pushes the piston.

Here's what the plan is I need a dyno for a new engine development program. small displacement engines, 50cc some day up to 200cc+. I need comparative data engine to engine, tuning, proto components, etc.. this is all diy budget stuff please keep this in mind. I come from automotive and race...

Homework Statement The jet engine of an airplane takes in 130 kg of air per second, which is burned with 4.3 kg of fuel per second. The burned gases leave the plane at a speed of 600 m/s (relative to the plane). If the plane is traveling 260 m/s, determine the power (hp) delivered...

Can anybody help me how to calculate the quantity of heat radiated from an diesl engine. any formula based on BHP? what are the assumptions that i need to make? what are the factors that i need to consider whilem calculating the heat radiated from an diesel engine

I am trying to replicate a JAVA based applet on MATLAB. Applet can be seen http://www.engr.colostate.edu/~allan/thermo/page6/EngineParm1/engine.html" . The theory behind the functions of the applet is http://www.engr.colostate.edu/~allan/thermo/page6/page6.html" . It is actually a finite...

Hi, I am using a model that estimates pressure (P) in an intake manifold. I think there is a mistake in its equations but I cannot find it. To simplify the problem we can make the following assumptions: - Only air fills the manifold: air comes into the manifold through the throttle (mass...

Homework Statement An ideal monatomic gas is the working substance of a Carnot engine. During the isothermal expansion, the volume doubles. The ratio of the final volume to the initial volume in the adiabatic expansion is 5.7. The work output of the engine is 9x10^{5}J in each cycle. Compute...

I found following claim from an inventor: “The limit of IC engine efficiency cannot be normally exceeded due to facts entropy cannot be decreased and 2nd law of thermodynamics (heat cannot flow from cold to hot body). Injecting water in the beginning of expansion stroke can overcome these...

Hi guys... we are currently interested -in our clip of aerospace engineering in my uni.- to build a complete jet engine ... unfortunately.. we have not yet found any detailed explanation to each step in doing so .. if you have any link or uploaded book or even you remember some manuals...

1. You're in an airplane that flies horizontally with speed 1000 km/h (280 m/s) when an engine falls off. Neglecting air resistance, assume it takes 30 s for the engine to hit the ground. a. Show that the airplane is 4.0 km high. b. Show that the horizontal distance that the aircraft...

Can anyone please explain me what is difference between Full Authority Digital Engine Control and ELectronic engine control in an aircraft gas turbine Engine ? What all parameters are controlled in EEC and FADEC ? What is the main difference ?

i understood brayton cycle etc.. but why is air compressed in the GT engine ? iS is anything related related to following reasons ? 1. FOr better combustion of fuel, if so why ? 2 IS it to increase the temperature of air, if so why ? 3 any other reason

Hi Engineering guys, why you can't think about modifying the locomotive engine fender to push away human beings and animals from track. You know, each day there are hunderds of human beings are getting trapped under the wheels of locomotives. Can you guys think about modifying the fender -...

I was taking apart a 2-stroke engine for a model aircraft and I'm a little confused about the types of bearings used for the connecting rod and crankshaft. So far, I know of the journal, needle, tapered roller, ball, and angular contact ball bearings. Does the connecting rod use a journal...