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提问求助类话题必须提供充足的已知条件，介绍为了解决问题已经做的工作。凡可以通过简单搜索或查阅教科书解决的问题，不应提问求助。连续发布提问求助、懒惰型提问、上帝式提问等，将受到处罚直至封号。

关于knsu的配比问题

杨彦照2024-05-16 IP:陕西

中文摘要

knsu的配比问题

关键词

knsu配比

众所周知若想制作100g的knsu，则需要的原料质量比例最好为kn：su=65：35（暂且称这个为A方案），

但是KNO3和 C12H22O11 完全反应的化学式为：

那么若要根据化学式制作一份100g的knsu，则需要

kn约73.9g，su约26.0g（暂且称为B方案），这样才不会存在反应不充分的情况

由此列出质量对比表（单位：g）：

kn su

A 方案 65.00 35.00

B 方案 73.92 26.07

可见，大家所惯用的配比，是在完全反应比例的基础上减少氧化剂kn 和增加还原剂su，而对比两种总质量相同但配比不同所产生的气体质量，如图：

显然B方案生成的四种产物的质量，均多于A，这样工作时岂不是会获得更多的物质喷出吗以获得更大的推力吗，考虑到发动机燃烧室的工作环境为高温高压，会影响反应速率和平衡，但为什么要采用不完全反应的配比呢，按照化学式来讲65g的kn只能反应22.9g的su，那剩下的12.1g的su怎么办？希望有大佬能解答我这位萌新提出的问题，不尽感谢！

来自特殊话题声明：求助提问

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某科学的超级屑

6个月7天前 IP:贵州

D885509

1楼

请不要执着于knsu，这本来就是玄学熬糖，之前尝试n次后整不明白就放弃了，后来都没动过，用其他的knsb，rnx都很好

对于火箭燃料基本都会偏离化学当量比，最主要原因是要降低产物温度，避免给发动机带来较大的冷却负担，况且部分燃料增大某一组分的比例，燃烧产物中固相（固体物质，这东西无法膨胀做功，对于增加推力起不了太大贡献）占比就会变高，损失比冲，用标准的当量比对于比冲的提高起不了太大效果，反而可能会带来很多弊端

对于knsu这个具体例子，会发现固体物质产物大大增加(k2co3),有堵塞喷口的风险造成超压从而发生事故，之前论坛里有人也做过一定的研究，70kn30su的比例提高了燃温，到了千多摄氏度，但我个人认为还是固相物质的影响更大，有时熔融覆盖在燃烧面上，可能会影响燃气对燃烧正向的传热反馈甚至哑火，如果你试过72kn的比例你可能会发现喷出大量的固体物质，凝固后多孔而较为坚硬，而且燃烧会断断续续

以上是我个人实践经验和目前水平的见解（话说为啥B例质量不守恒啊，瞪眼睛看半天）

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