بررسی تاثیر افزودن آب بر عملکرد و آلایندگی موتورهای بارهمگن ‌اشتعال تراکمی ‌تغذیه شده با سوخت هپتان نرمال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجو

2 صنعتی سهند-مهندسی مکانیک

چکیده

هدف از مطالعه حاضر بررسی تاثیر افزودن آب بر احتراق همگن سوخت هپتان نرمال است. جهت نیل به هدف مذکور یک موتور بارهمگن ‌اشتعال تراکمی ‌با استفاده از یک مدل ترمودینامیکی چند منطقه‌ای شبیه‌سازی شده است. سوخت موتور مورد نظر هپتان نرمال بوده که فرایند احتراقی آن با استفاده از یک مکانیزم سینتیک شیمیایی شبه توسعه یافته شبیه‌سازی شده است. در ابتدا دقت مدل در پیش بینی عملکرد و آلاینده‌های احتراق همگن سوخت هپتان نرمال با استفاده از داده‌های تجربی ارزیابی شده و سپس مقادیر مختلف آب به مخلوط سوخت و هوای داخل محفظه افزوده شده و اثرات آن بر عملکرد و آلایندگی موتور بررسی شده‌اند. نتایج به دست آمده نشان ‌می‌دهند که افزودن آب، بیشینه دما و فشار داخل محفظه احتراق را کاهش داده و سبب به تاخیر افتادن آغاز احتراق ‌می‌شود. افزودن مقادیر بالای آب، سبب بدسوزی شده، بازده حرارتی موتور را به طور محسوسی کاهش داده و آلاینده‌های خروجی از موتور را افزایش ‌می‌دهد. بیشترین اثر آب بر عملکرد و آلایندگی موتور، اثر حرارتی آن بوده و اثر شیمیایی آن بر موارد ذکر شده قابل صرف‌نظر است. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation on Effects of Water Addition on Performance and Emissions of an n-heptane Fueled Homogeneous Charge Compression Ignition Engine

نویسندگان [English]

  • shiva samadi 1
  • Elahe Neshat 2
1 student
2 صنعتی سهند-مهندسی مکانیک
چکیده [English]

The main purpose of current study is investigation on the effect of water addition on n-heptane homogenous charge compression ignition combustion. A multi zone model coupled to the semi-detailed chemical kinetics mechanism is used for simulation of n-heptane homogenous charge compression ignition combustion. First, the accuracy of the model was estimated for two different operating modes, and then seven different amounts of water were added to the fuel and its effects on n-heptane combustion were investigated. Thermal, chemical and dilution effects of water are studied using artificial inert species method. The results show that the start of combustion was retarded by water addition due to the thermal effect of water. Peak values of in-cylinder pressure and heat release rate decreases by water addition. Water addition has caused the maximum amount of radicals in the combustion chamber to be reduced and the time of their formation is delayed. Water addition increases the amount of unburned hydrocarbons at exhaust. Thermal effect of water on start of combustion and emissions formation is more significant than its dilution and chemical effects. Using small quantities of water will increase the thermal efficiency of the engine and reduce emissions from it.

کلیدواژه‌ها [English]

  • Homogeneous combustion
  • n-heptane
  • Water addition
  • Engine emissions
  • Multi zone model
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