Diesel Definition and 140 Threads

Why does heat addition happen at constant pressure in diesel cycle ? what is the basic concept behind it?? please do enlighten me on this topic. thanks in advance

In this diagram,non-ideal combustion in a diesel engine takes-up a lot of the fuel energy. Why is this so? Also intrigues me that there is a lot more non-ideal combustion at low load than higher loads. Is this because the diesel engine operates with a lower compression ratio at lower loads? This...

Homework Statement Helium in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under air standard conditions, the thermal efficiency of this cycle is: a) 79.5% b) 20.5% c) 61.4% d) 67.4% e) 84.3%...

Homework Statement Construct a Microsoft Excel® spreadsheet that models an internal combustion engine based on the ideal air-standard Diesel cycle. Given the minimum temperature (##T_1##) and pressure (##P_1##) in the cycle, the engine size (##V_1##), the compression ratio (##r_v##), the...

Hello all; I have been thinking about this for some time and searching through the internet for it but couldn't get a satisfactory answer for it, so i decided to ask this to you. Here is my question: If diesel fuel has more energy in it than gasoline does and if diesel engines are more...

I've read on many sites that diesel cars usually accelerate slower than gas cars. Why is that though? Diesel engines reach higher torque and at lower RPMs so why is it that gas cars accelerate faster? Are diesel cars just a lot heavier or something?

Hi everyone. So I am trying to write a very simple engine simulator for a game, and I have a question about how diesel engines accelerate and decelerate when a machine is in neutral. I have found some videos of a machine at full throttle and then the throttle released, and the engines...

Hi, my lecturer has given us two graphs showing the general shapes of the max torque curves for both gasoline and diesel engines, and they clearly show that the diesel engine has a much flatter torque curve than the gasoline engine, but not explained why. Expected to find this information...

what is the cheapest and low power diesel engine available at present? i am seeking 3 KW engine with of minimum weight available for my college project.

Homework Statement Derive a formula for the efficiency of the Diesel cycle, in terms of the compression ratio V1/V2 Homework Equations e=\frac{W}{Q_{h}} w= ∫pdV The Attempt at a Solution Now I know I should have used e=1-\frac{Q_{c}}{Q_{h}} to get it but he said it is...

Diesel, Otto , Joule TRICK? Hi Guys, I try to callculate the efficiency for a cycle Process. For Diesel, Otto and Joule Processes you can write the efficiency as a really small equation. I have seen that for example sometimes the adiabatic equation is used, but i don't understand in which...

I'm looking to design a range of diesel engines for use in road cars (for when i win the euro millions ;) , consisting of a flat 4, straight 6 and v8. all with a cylinder capacity of 666cc (per cylinder). As we know the biggest downfall of diesel engines is the weight, especially that of the...

Would this mixdure be equivalent in performance and fuel economy as 95 octane gasoline? Any possible damages to the engine if I try this mixdure? Br. Vidar

Is there a way you can calculate exhaust flow using intake flow and exhaust temp? Maybe I would need fuel quantity as well. I just need a rough idea.. It's for on a diesel.

I have been searching for hours and have conflicting data. Basically if engine A has 18:1 CR and 0psi boost and engine B has 13:1 CR and 8.5psi boost, the pressure at TDC-Compression is the same or rather the "effective CR" is the same. However, engine A is 16.7% hotter at TDC but has 43.7%...

As the title says, why diesel engines produce less CO2 than gasoline engines and how is this related to the more torque and less power in diesel engines? PLEASE only a fluid dynamics or thermodynamics approach. Spent hours on searching to find why petrol engines produce more CO2 emissions...

Homework Statement The Diesel cycle is an idealized representation of the process that occurs in a Diesel combustion engine, as shown in the graph below. Starting at point a, the Diesel cycle consists of an adiabatic compression, an isobaric expansion, and adiabatic expansion and an isochoric...

Hi all. I was wondering what benefits one gains by using a diesel-electric transmission over a simple diesel transmission (such as in locomotives, which now often use diesel-electric transmission). Is there not a loss in energy as one convert mechanicals power to electric power? Why not use...

I haven't read or heard about anywhere, but is it possible to run a diesel engine on gasoline/petrol?

Im studdying PV diagrams for dieslel and petrol engines, and I've noticed that for Diesel the fuel is combusted at constant pressure as opposed to petrol (gasoline) which is at constant volume. I know that the area inbetween the lines is the net work done by the engine. So if you look at the...

1. Homework Statement given: diesel cycle, P1V1 P2V2 P3V3 P4V4 - all known T1 = 20°c specific heat capacity constant pressure = 1000j/kgk specific gas constant = 287j/kgk compression index = 1.4 2. Homework Equations heres where i am stuck! 3. The Attempt at a Solution Hi...

I want to plot a cylinder pressure vs crankangle diagram for a 4 cylinder naturally aspirated diesle engine ,do I require AVL boost for this ?and how can you plot it manually?

Hello, I'm currently doing research into the various effects of exhaust gas recirculation for my dissertation at university, the engine being tested on is a naturally aspirated 4 stroke diesel Ford straight 4 (probably out of a transit or something of the sort). Last week I recorded cylinder...

Hi there! I have here a CAT Standby 650 ekW 813 kVA 60 Hz 1800 rpm 480 Volts generator with CAT 3412C TA Diesel Engine. Im trying to come up with maximum apm load which can be connected to this generator. What formula should I use for that? simple one W=V*A, where A=W/V good enought? Or...

what will happen if we put petrol in a diesel engine and diesel in a petrol engine? i think it will not work but why will it not work

Hi evry1! Just wanted to know that which has got higher efficiency - 2 stroke diesel engine or 4 stroke diesel engine. I believe that direct injection of fuel in diesel engines prevents the loss of unburnt fuel in exhust of 2S engine. And simpler mechanism and lesser no. of moving parts in 2S...

Before I started putting it in the reservoir, some fuel came out to the exterior part of the reservoir, and some of it even spilled on the door and the tire. And that tire is flat, because it loses the pressure in some days, so maybe some diesel fuel even went inside it. Is it dangerous to leave...

Homework Statement The problem is in the attached document Homework Equations attached in pdf document The Attempt at a Solution 1->2 adiabatic compression T2=(V2/V1)^1-(Cp/Cv) = 987.7K w1=nCvdT = (1mol)((3/2)*8.314J/molK)(987.7K-298K) = 8601.3 J 2->3 w2=-PdV=-Pmax(V3-V2)...

Homework Statement A diesel engine requires no spark plug. The air in a cylinder is compressed so highly that the fuel spontaneously ignites when sprayed into cylinder. If the air is initially at 20°C and is then compressed by a factor of 15 in volume, what final temperature is attained...

Homework Statement For a assessment task at school, I have to compare various types of fuel, one of which is diesel. One aspect of the task is to name the chemical formula for each fuel. The Attempt at a Solution I keep finding that the formula for diesel is C12H23. I know that diesel is...

Does anyone know any sources (i.e. car manufacturers) that provide the exhaust air flow parameters for the some specific car engines? I need stats on various otto & diesel cycle engines (small compact car engines, large semi truck engines, etc.). When I say exhaust air flow parameters, I need to...

It will be interesting to see if anything comes out of this. Sounds too good to be true. Continued... http://news.yahoo.com/s/ap/20110227/ap_on_bi_ge/us_growing_fuel

Low Temperature Diesel Fuel (urgent) I'm having a problem with diesel fuel at the moment and would greatly appreciate insight into the subject. I'm currently stranded in Colorado where it's somewhere like -10 degrees (F) and our diesel truck isn't starting. I've narrowed down the problem to...

i recently saw the CRDi system ,its working and its performance test.Now there is a particular mechanical pressure control valve being used in the rail to prevent excess pressure,this valve works each time pressure goes beyond the limit and brings it down,but it is said that this happens only...

I am doing a heat exchanger report for a domestic boiler, and would anyone know what the specific heat capacity for diesel in its liquid and gas(having been combusted) state. In J/kgK please thanks

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 VERY interested in IDI diesel engines and the upper limits of their efficiency range. I used to post on vwdiesel.net but the site is down now. I was looking into increasing the efficiency of the 1.6l turbo diesel engine by making a new"er" head made from a preexisting aluminum one out of...

[SOLVED] Quick question about ''Cut-off ratio'' in the Diesel Cycle. So I've been studying the Diesel Cycle, and I've come up with something called the ''cut-off ratio'', which is simply a name for the ratio of expansion r_E. But I'm getting different definitions for this ratio. For example...

Hi, Could someone tell me the rough temperature the air gets to under compression, just prior to the diesel being injected and auto igniting? thanks in advance

how would you find the correct formula for the temp at state 3 and 4. i found it for 1 and 2

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...

I am designing a stop system for a old diesel engine. The application I am using needs a pull type solenoid that can have a stroke of 9/16" - 1 1/2". it needs to have a return spring of at least 20 lbs. It needs to be continuous duty ( probably 2 coil).This will be used as a "engage to run"...

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 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...

I had some diesel fuel outside and it was snowing pretty good and it looked like it was glowing bright green/yellow against the white background. Was it glowing or was it just an illusion?

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?

Hi, I need the compressibility of diesel, depending on density, pressure(0-200bar) and temperatur. Do you know where to find these values? Thanks Inkog

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?

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...

I wonder is what are the legal and application area difference between "Tier","EPA" and "California" Emission Standard in U.S (I am not asking the allowable emission levels). Also, Is there any difference in on-road and off-road standads(again, I am not asking the emission levels)? Thanks...