Turbo-Tech

Forum de discussion regroupent les maniaques de Performance!
 
AccueilPortailGalerieCalendrierFAQRechercherS'enregistrerMembresGroupesConnexion

Partagez | 
 

 Comment fonctionne les # de Trim et les AR sur les Turbo

Aller en bas 
AuteurMessage
JRacing

avatar

Messages : 24
Date d'inscription : 27/02/2008
Age : 28
Localisation : St-Georges

MessageSujet: Comment fonctionne les # de Trim et les AR sur les Turbo   Jeu 4 Déc - 13:01

[quote name='Belo' date='Dec 8 2004, 07:14 PM' post='190253']
Bon suite à certaines questions que je me posait moi même voici des infos sur certains concept interessants concernant les turbos...

c est en anglais mais bon...

Gênez-vous pas pour en ajouter...

Trim-
Trim is an area ratio used to describe both turbine and compressor wheels. Trim is calculated using the inducer and
exducer diameters. As trim is increased, the wheel can support more air/gas flow. Use these formulas when calculating trim:

TrimCompressor = (Inducer Diameter)2 X100
(Exducer Diameter)2

TrimTurbine = (Inducer Diameter)2 X100
(Exducer Diameter)2

A/R-
A/R describes a geometric property of all compressor and turbine housings. Increasing compressor A/R optimizes the performance for low boost applications. Changing turbine A/R
has many effects. By going to a larger turbine A/R, the turbo comes up on boost at a higher engine speed, the flow capacity of the turbine is increased and less flow is wastegated, here is less engine backpressure, and engine volumetric efficiency is increased resulting in more overall power.

1. Pressure Ratio – Ratio of ABSOLUTE outlet pressure divided by ABSOLUTE inlet pressure.

2. Corrected Airflow – Represents the corrected mass flow rate of air, taking into account air density (ambient temperature
and pressure).

3. Turbine Corrected Flow – The turbine flow is also corrected for temperature and pressure at the turbine inlet (exhaust manifold).

3. Efficiency Contours – The efficiency contours depict the regional efficiency of the compressor set. This efficiency is simply the percentage of turbo shaft power that converts to actual air compression. When sizing a turbo, it is important to maintain the proposed lugline with a high efficiency range on the map.

4. Surge Line – The surge region, located on the left-hand side of the compressor map, is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur.

5. Choke Line – The choke line is on the right hand side of the compressor map and epresents the flow limit. When a
turbocharger is run deep into choke, turbo speeds will increase dramatically while compressor efficiency will plunge (very high
compressor outlet temps), and turbo durability will be compromised.

ca aide à lire les turbos map :up:

<small>[ 08 December 2004, 05:56 PM: Message edited by: Garrett ]</small>
[/quote]
Revenir en haut Aller en bas
Voir le profil de l'utilisateur http://www.HPerformance.1fr1.net
 
Comment fonctionne les # de Trim et les AR sur les Turbo
Revenir en haut 
Page 1 sur 1
 Sujets similaires
-
» Avec quel CV avez vous débuté ???
» comment repartir le moteur apres hivernisation
» Indicateur du trim
» Comment baisser son index ?
» comment acquérir un "bon" swing

Permission de ce forum:Vous ne pouvez pas répondre aux sujets dans ce forum
Turbo-Tech :: Section Technique :: Induction Forcée (Turbo,Supercharge,nitrous)-
Sauter vers: