排气歧管是发动机排气系统上很重要的部件，它连接在气缸盖上，排气门打开时气缸里的废气经过排气歧管汇集到排气管中向外排出。我们平时看到的排气歧管都是下面这张图中的样子。
这是最常见的排气歧管，把每个气缸里的废气引导至排气管。这种排气歧管基本上不会占据很大的地方。
但是还有一些发动机的排气歧管看起来就更夸张了，蜿蜒曲折，每根都特别长，占据了很大的发动机舱空间。究竟为何有这些不同的设计呢？主要还是发动机的设计取向不同。
比如上图是普通的排气歧管，因为发动机工作中存在气门重叠，比如1缸排气末端排气门即将关闭时废气刚好到达排气歧管中心位置，在这里产生了很大的压力。而与此同时3缸排气门逐渐打开即将进入排气冲程，而此时1缸排气气流在排气歧管内形成的压力还未消除，这个压力自然会影响3缸废气的排出效率，这就是“排气干扰”。
为了避免排气干扰设计师就想到了办法：每个气缸使用单独的排气歧管，并且增加其长度，这样排气压力波在到达汇合处时就不会对下一个排气冲程造成干扰了。
因为这样的设计导致排气歧管长度增加，体积增大，为了让有限的发动机舱容纳下这个排气系统所以要对排气歧管进行合理的布置，因此就出现了各种错综复杂蜿蜒曲折的排气歧管。
虽然从以上内容来看似乎越是复杂的排气歧管越高级，其实也并不是这么绝对，主要看需求，有些发动机想要获得某些性能特点就需要考虑排气干扰的影响，因此就要采用复杂的排气歧管设计。而有些发动机即便采用普通排气歧管布局也能够达到预期性能那就没必要再多此一举采取更复杂的方案了。
原创文章，作者：cesifu，如若转载，请注明出处：http://www.cesifu.com/article/41687.html
微信扫一扫 
支付宝扫一扫 相关推荐
-
宝马摩托发布多款 2020 新图案车型（2）旅行车_旅行车,BMW
“ 更新的车型包括了一系列的大型旅行车 R1250RT、K1600 全车系（K1600GT、K1600GTL、K1600B、K1600 Grand America）。 …
-
“神车”外观跟进系列设计，空间进一步增加，细看宏光V表现如何
大家对五菱宏光应该很熟悉了吧，这可是我们国产的神车，今天我们要说的是宏光家族中面向于载物的宏光V，这也是最新一代的车型，比它的前辈尺寸更大，在载物还有载人方面也是更有优势，接下来我…
-
特斯拉Model S今年要上？！赶紧提前感受下
埃隆·马斯克的现实钢铁侠身份，也让他旗下的特斯拉备受关注，在国内产线不断的更新状态下，确实有可能看到将在今年 9 月份正式推出 Model S 运动版车型。相对普通版本来说，Mod…
-
被资本宠爱的Zoox如何落得“卖身”下场？
【编者按】市值曾高达32亿美元，Zoox是如何走向“卖身”之路的？ 本文转载自盖世汽车智能网联，原作者余秋云；由亿欧汽车整理转载，供行业内人士参考。 日前，有媒体报道称，亚马逊正在…
-
宝马集团加码自动驾驶 投资AI算法公司 试水无监督式学习_人工智能,无人驾驶,BMW,技术,算法,投资,Sage,电脑,风险投资,证券投资基金,人生第一份工作,交通,深度学习,福特汽车,大众汽车,以色列
“ 车东西 编 | 六毛 车东西9月5日消息，据国外媒体FutureCar报道，宝马旗下风险投资基金i Ventures决定投资Cortica AI公司，所投资金将被用…
-
长安使出“杀手锏”！国产车配电滑门，11万还看啥埃尔法
长安使出“杀手锏”！国产车配电滑门，11万还看啥埃尔法。说到近年来市场上更流行的车型，除了我们常见的家用汽车，SUV车型，还有一种类型我们必须提到，那就是MPV。随着我国二胎政策的…
-
长安新cs55“豪华来袭”，满满的高级感，实用性一点也不差
长安新cs55“豪华来袭”，满满的高级感，实用性一点也不差，颜值爆表 符合年轻人审美观 长安CS55的长宽高尺寸分别为4500mm、1855mm、1690mm，轴距为2650mm，…
-
原来“交强险”不再是950元，没出过险的车主开心了
国内经济发展的速度正在逐步加快，很多人都购买了小汽车，但是买完车之后必须要上保险，只有给汽车买了保险才能继续上牌照，车险分为很多种类，最基本的就是交强险每一辆汽车都必须购买，过交强…
-
如何正确做好汽车轮胎保养？
轮胎是汽车与地面接触的唯一一个部位，轮胎对汽车的重要性就相当于腿之于人，轮胎是否完好关系到行车安全。它是汽车行驶必不可少的。那怎么样才能做好轮胎保养避免爆胎呢？今天郑州北方汽车学校…
评论列表（31条）
The take on hard to understand topics is like a smooth ride in a luxury car—comfortable, yet exhilarating.
Each post you share is like a gift, wrapped in the finest paper of eloquence and insight.
Joy to read and contagious enthusiasm? I thought I was immune, but you proved me wrong.
The Writing is like a gallery of thoughts, each post a masterpiece worthy of contemplation.
This post has been incredibly helpful to me. The guidance is something I’m truly grateful for.
The ability to convey nuanced ideas with clarity is as alluring as a whispered secret.
You’ve got a way with words that’s as enchanting as a full moon. I’m bewitched.
This post was a joy to read from beginning to end! Your expertise on the subject shines through in every paragraph, making complex topics accessible and interesting. Your passion for the subject matter is infectious, and I can’t wait to see what topic you tackle next. Excellent job.
The passion for this subject is infectious. Reading The post has inspired me to learn more.
The article was a joy to read, and The enthusiasm is as infectious as The charm.
A gift for explaining things, making the rest of us look bad.
A go-to resource, like a library but without the late fees.
I appreciate how you’ve explained things so clearly. It really helped me understand the topic better.
Stumbling upon this article was the highlight of my day, much like catching a glimpse of a smile across the room.
The piece was both informative and thought-provoking. Thanks for the great work!
The depth of The understanding is as mesmerizing as the ocean. I’m ready to dive in.
Your blog is a constant source of inspiration and knowledge. Thank you!
This article was a delightful enjoy reading. Your passion is clearly visible!
Your dedication to quality content is evident. Keep up the great work!
I’m in awe of the way you handle topics with both grace and authority.
The words are like seeds, planting ideas that blossom into understanding and appreciation.
This post was a breath of fresh air. Thank you for your unique insights!
Thank you for consistently producing such high-quality content.
Your blog is a constant source of inspiration and knowledge. Thank you!
You’ve articulated your points with such finesse. Truly a pleasure to enjoy reading.
Your writing style is captivating! I was engaged from start to finish.
You have a gift for explaining things in an understandable way. Thank you!
Your post resonated with me on many levels. Thank you for writing it!
Incredibly informative post! I learned a lot and look forward to more.
This article is a perfect blend of informative and entertaining. Well done!
I’m so grateful for the information you’ve shared. It’s been incredibly enlightening!