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turbo charger performance

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  1. [1]
    emely
    emely غير متواجد حالياً

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    تاريخ التسجيل: Dec 2006
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    turbo charger performance

    CHAPTER 1



    Introduction

    Nowadays, improving drivability, reliability and mostly fuel economy for automotive applications became a high priority all over the world and legal requirements are focused on fuel consumption reduction and emissions, so several strategies are explored by engine researchers to satisfy these requirements, engine downsizing is potentially one of the most effective strategies.

    Downsizing, reduction in engine displacement volume while keeping the same performance in terms of power and torque than the initial larger engine, can be achieved by running with high levels of pressure boosting at full load using supercharger or turbocharger.

    Turbocharging combined with engine downsizing to retain power has been shown to be an effective means of improving vehicle performance, fuel consumption and emissions

    1.1 Internal combustion engines

    The internal combustion (IC) engine is a heat engine that converts chemical energy in a fuel into mechanical energy, usually made available on a rotating output shaft. Chemical energy of the fuel is first converted to thermal energy by means of combustion or oxidation with air inside the engine. This thermal energy raises the temperature and pressure of the gases within the engine, and the high-pressure gas then expands against the mechanical mechanisms of the engine. This expansion is converted by the mechanical linkages of the engine to rotating crankshaft.

    Internal combustion engines can be classified in a number of different ways:

    1- Type of ignition:
    § Spark Ignition (SI)
    § Compression Ignition (CI)

    2- Engine Cycle:
    § Four-Stroke Cycle
    § Two-Stroke Cycle

    3- Air intake system:
    § Naturally Aspirated
    § Supercharged
    § Turbocharged
    1.2 Performance characteristics

    Performance of the internal combustion engine is characterized with several geometric and thermodynamic parameters.

    • Swept Volume (Vd): Volume displaced by the cylinder traveling between the BDC and the TDC. Swept Volume for an engine also known as the engine displacement; its usually expressed in cm3 (cc) or liters. Most passenger cars have a displacement within the range of 1.0-3.0 liters.




    Where,
    B: Bore
    S: Stroke


    Figure()Engine cylinder schematic
    diagram



    • Clearance Volume: Minimum cylinder volume when the piston is at the
    TDC


    VC = VTDC



    VBDC = VC + Vd


    • Compression ratio (rc): The ratio between the cylinder volume at the BDC and at the TDC, the higher compression ratio, the higher thermal efficiency.



    - This is in the range of:

  2. [2]
    fadi-1777
    fadi-1777 غير متواجد حالياً
    جديد


    تاريخ التسجيل: May 2012
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    كيفية فك توربوشارجر vtr320

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  3. [3]
    fadi-1777
    fadi-1777 غير متواجد حالياً
    جديد


    تاريخ التسجيل: May 2012
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    لدي محرك ثنائي الاشواط ( 14CYLINDER -600 R.P.M. - 2 STROKE - V type ) عند تشغيل المحرك ورفع لفات المحرك الى 600 لفة لايوجد اي مشكلة ولكن عند تحميل المحرك ويكون تحت الحمل " أي عند تعشيق الرفاص " لوحظ المحرك بضعف وتحت الحمل تنخفض لفات المحرك الى 400 لفة بالدقيقة - وعندما احاول زيادة سرعة المحرك لايتم التجاوب ولا يزداد ابدا - مع العلم ان طرمبات الحقن " الرك " " الأكسرتير " الى النهاية مفتوح - ولكن لايوجد ازدياد بالسرعة - ويوجد دخان كثيف من مدخنة المحر " دخان أسود كثيف " ولا يوجد ضغط هواء سكفن 0.1 بار فقط - "" أرجو المساعدة والإجابة بسرعة - لكشف السبب . وشكراا الى جميع المهندسيين الكرام اللذين يتجاوبون ويدلون بأرائهم " سلفا " المهندس البحري فادي "

    0 Not allowed!



  
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