Nghiên cứu góc đặt vòi phun nhằm hạn chế hiện tượng nhiên liệu dính ướt thành ống nạp trên động cơ phun xăng đa điểm
291 lượt xemDOI:
https://doi.org/10.54939/1859-1043.j.mst.85.2023.118-125Từ khóa:
Góc đặt vòi phun; Dính ướt; Phun đa điểm; Đường ống nạp.Tóm tắt
Kỹ thuật phun nhiên liệu trên động cơ xăng đã có những bước phát triển đáng kể, từ bộ chế hòa khí truyền thống đến hệ thống phun xăng đơn điểm, đa điểm và phun trực tiếp. Bài báo xây dựng một mô hình 3D bằng phần mềm FloEFD cho hệ thống phun xăng đa điểm. Một giải góc đặt vòi phun từ 22 đến 30 độ đã được khảo sát nhằm đánh giá ảnh hưởng của góc đặt vòi phun đến hiện tượng dính ướt và mức độ giảm áp trên đường nạp. Các kết quả cho thấy góc phun 25o giúp nhiên liệu phun thẳng vào họng nạp không va chạm vào thành đường ống, đồng thời giúp cho không khí và nhiên liệu được hòa trộn tốt hơn các trường hợp còn lại. Mô hình mô phỏng thiết lập trong bài báo giúp xác định góc phun hợp lý và có thể làm cơ sở cho các thử nghiệm trên động cơ thực tế, từ đó giúp nâng cao hiệu suất và giảm suất phát thải cho động cơ phun xăng đa điểm.
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