یکی از موضوعات مهم در تحقیقات موتورهای احتراقی خودرو، کاهش آلاینده ها و بهبود بازده و توان است. یکی از روش های نوین در این زمینه، تزریق آب در منیفولد ورودی موتور است که می تواند هم بر آلایندگی و هم بر عملکرد موتور تأثیرگذار باشد. در این پژوهش، تأثیر تزریق آب به صورت پودری پشت دریچه گاز بر مشخصه های عملکردی و آلایندهها به طور تجربی بررسی شد. بدین منظور یک ستاپ آزمایشگاهی طراحی و نصب گردید تا پاشش آب در زمان ها و فواصل مشخص انجام و پارامترهای مربوطه ثبت شود. آلاینده های خروجی توسط دستگاه پنج گاز و پارامترهای موتور به وسیله دیاگ اندازه گیری شدند. نتایج نشان داد که تزریق آب موجب خنک تر شدن مخلوط سوخت و هوا، افزایش چگالی و بهبود راندمان حجمی می شود و همچنین نسبت تراکم بالاتری را امکان پذیر می سازد. این فرآیند علاوه بر کاهش دمای احتراق و جلوگیری از کوبش، باعث افزایش توان موتور نیز گردید. در مجموع، این روش در کاهش مصرف سوخت، افزایش راندمان و کاهش آلایندگی موتور مؤثر ارزیابی شد.
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