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关于硝酸铵钙制硝酸铵的若干问题
zx-48750
7年11个月前
回复于
化学
内容:无奈的是合成完毕后假期结束,硝铵基
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mithril
16年1个月前
发表于
化学
内容:产品用途 硝基烷烃为优良的溶剂,对纤维素化合物、聚氯乙烯、聚酰胺、环氧树脂等均有良好的溶解能力,并可作为溶剂添加剂和
燃料
添加剂。,如黄色炸药TNT就是甲苯经硝化生成的三硝基甲苯;苯经硝化制得产品为硝基苯,是制造染料的原料;甲烷经硝化得到硝基甲烷,是一种火箭
燃料
;纤维经硝化形成一种透明塑料-赛璐珞,最早用来制造电影胶片,后来因为极其易燃
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15年5个月前
发表于
喷气推进
内容:不然就会导致很多不好的现象发生(这些当然知道~pia~)然后在一枚火箭中提供动力的就是发动机,而发动机的设计影响到了整个火箭的飞行状态,而发动机中有很多关键,最关键的要算是喷管了,喷管在发动机中起着不可小视的作用,我们知道火箭
燃料
是起到储存能量的作用,,而释放的方式是热能释放,而它能够将
燃料
时放出来的热能尽可能多的转换为动能,那么这样一来,一个喷口的设计就显得十分重要了。,就算是你已经看到很准确了,还是会有偏差,就算是很小,但是建立在这种很大的基量(高速度,大流量)上,就会得到“差之毫厘,谬之千里”的结果,这无疑是一个悲剧.....很大的悲剧....也就是这么几个问题,浪费了大家大量的
燃料
无控硝糖固体火箭 空梦二号(KM-2)发射
星航天
1年10个月前
发表于
喷气推进
内容:火箭回收后只有箭体的树脂外壳有破损内部传感器等元器件均正常工作,要加大降落伞直径减少下落速度,肉眼观测不到火箭的最高点(和雪后的天气有关)复查发动机可以看出工作正常,未漏气(密封圈以上无
燃料
残渣)发射人员
【基本原理讲解】关于喷管特性的说明
猎鹰
10年0个月前
发表于
喷气推进
严肃内容: 专著/论述
内容:只有业余圈才论这个,因为很炫,看上去高大上吧,虽然没意义“ 实际上马赫环就只是一种激波现象,与比冲性能无关,不然书上也不会提及这玩意,马赫环看不看得见很大的因素是
燃料
本身的性质和相机的好坏。
ABC火箭技术之 自适应烧蚀环氧树脂喷管
ABC
16年4个月前
发表于
喷气推进
内容:即燃烧面积是由小到大变化的, 而喷喉面积却是固定的, 这就造成了开始时压力太低,而工作后期却太大了, 波动非常大, 造成了
燃料
的浪费.
伦琴射线发生器资料贴
虎哥
13年9个月前
发表于
核技术与核仪器
内容:最近研究火箭发动机及
燃料
探伤问题,刚好发现一台伦琴射线发生器可以用,有点兴趣,网上找了些资料转帖在这里慢慢看。
出售大量闲置物品(价格可私聊)同时寻找失散多年的盟友【向拉风定了一个火箭发动机700元】
Zhangrky
9年6个月前
发表于
跳蚤市场
内容:这是一种外燃发动机,使
燃料
连续地燃烧,膨胀空气(或氦气或氢气) 作为介质使活塞运动,膨胀气体在冷腔冷却,反复地进行这样的循环过程。
无线电能传输方式分类及原理
公众号EV技研作者1900
5年5个月前
发表于
电动汽车
内容:来临无刷电机驱动电路结构解析电动汽车背后藏着——石油、战争、地缘政治6分钟完成充电,续航320km——东芝TNO/NCM电池初探老铁,来杯特斯拉专利文献不,电磁口味的【日本庆应大学、群马大学数据】EV与
燃料
车的能量效率对比驾照依旧免不了
关于一些试车标准化的建议
虎哥
13年2个月前
回复于
喷气推进
内容:固体火箭发动机的点火是一件很严肃的事情,采用什么样的点火方式,产生多少热点,温度如何,初始点火压有多高等,这些都要考虑,多数种类的
燃料
点火方式不对就不能正常工作。
发展全球生态系统以支持氢动力飞行(空客转载)
飞友一只
2个月27天前
发表于
航空技术
特殊话题: 时事时政
内容:例如,氢气的单位质量比能量是传统喷气
燃料
的三倍,使其成为比电池更有效的脱碳能源。
珍爱生命,掀起普及科技爱好安全常识的新高潮
科创网
12年9个月前
发表于
社区公务
内容:——天易近日有媒体报道一名中学同学在自制火箭
燃料
时发生爆炸事故,造成截肢、失明的严重人身伤害和家庭财产的巨大损失。
自制PVC土豆炮,电点火,乙醇动力
helium
8年5个月前
回复于
极客DIY
内容:我有几个建议(安全为上):1,使用氢氧
燃料
的时候,这种PVC材质会炸膛的,建议是改小燃烧室容积以及使用金属材质的燃烧室。
【悲剧】少年自制小火箭推进器被炸残 想作当代诺贝尔
cqforever
12年9个月前
回复于
社区公务
内容:试制小火箭动能
燃料
结果引发爆炸 “我从网上看到有一种小火箭推进器很先进,自己就想制作一个。”,躺在奶奶家床上的武越说,他从网上得知,制造小火箭的动能
燃料
需要氯酸钾和赤磷这两种原料,就和两个同学一起于4月2日在安阳市彰德路上一家化工门市部买了氯酸钾和赤磷各一斤,装入两个玻璃瓶子带回家,并于4月3日上午,9时30分在家试制小火箭的动能
燃料
。
日本发射太空帆船反弹太阳粒子向前推进
德阳李
14年10个月前
发表于
极客DIY
内容:津田雄一说:“太阳帆这项技术让无
燃料
太空旅行成为一种可能,只要有阳光存在便可获得前进动力。
【QHarryQ Studio】征途一号(75mm小型气象火箭)成功发射
qharryq
11年6个月前
发表于
喷气推进
内容:v_show/id_XXXXXXXXXXXXXXXXml 火箭部分参数: 外径:75mm 箭体长度:1300mm 发射重量:5.3kg 发动机:50mm 金属发动机 (空重1.25kg)
燃料
百度百科“万户一号”草稿
拔刀斋
13年3个月前
发表于
喷气推进
内容:“这是因为隔热层有一个头发丝大小的缝隙,当固体
燃料
瞬间燃烧时,产生非常大的破坏力,将铝合金的发动机撕开一条缝,最后发动机就报销了。”,但精心准备了3个月的火箭已经整装待发,
燃料
已经灌注。,103cm 二级长度:100cm 头锥长度:40cm 连接部分长度:4cm 总重:11.793kg 外壳材质:HD-PVC 发动机壳体材质:6061-Al(铝合金) 发动机喷口材质:45#钢
燃料
,:改性KNDX(一种固体
燃料
) 一级推力:288.4N;总冲:622.4N/s 二级推力:188.6N;总冲:409.4N/s 降落伞材质:尼龙-66 仿真软件:MATLAB,Simulink,
未来无人机的技术发展趋向
yang6661262
13年1个月前
发表于
航空技术
内容: ● 减小涡阻力技术(如:升力系统和翼尖涡轮) ● 低雷诺数下的层流到紊流的转捩技术 ● 气动弹性控制技术 ● 燃气轮机或活塞发动机在高压比状态下的工作 ● 可供选择的推进系统(如:
燃料
电池
YT-3发动机爆炸原因分析总结(1)—金属结构
虎哥
13年2个月前
发表于
喷气推进
内容:爆炸原因是多方面的,既有
燃料
燃速超出预期,也包括发动机耐压不达预期。
对电动汽车的再思考
lzqlhk
13年4个月前
发表于
极客DIY
内容:随着油价的上涨和车辆的日渐增多,
燃料
问题就显得更为重要了.”氢”作为新一带的石油产品的替代品,由于其研制周期和成本等诸多因素的影响,一时间很难普及,所以人们应该更加关注电动汽车的发展.
风力发电概述
1211
18年0个月前
发表于
电气电工
内容:但风力机仍存在若干不足之处,首先是能量输出不稳定,特别是大型风力机的利用率低,作为独立能源的条件还不具备;其次,风力机的安全可靠性尚无充分保障;另外,风力机的成本在短期内尚不足以与矿物
燃料
相竞争。
电机的体格越大,效率越高?
公众号EV技研作者1900
5年8个月前
发表于
电动汽车
内容:23740项汽车专利事件】调查电动汽车背后藏着——石油、战争、地缘政治6分钟完成充电,续航320km——东芝TNO/NCM电池初探老铁,来杯特斯拉专利文献不,电磁口味的【日本庆应大学、群马大学数据】EV与
燃料
车的能量效率对比
自己制作完美的 DeLaval 喷嘴。
第七骑士团
12年1个月前
发表于
喷气推进
内容:虽然不准,因为实际喉咙需要的是你
燃料
的面积。
先行者4号火箭发射
彩虹之巅
11年11个月前
发表于
喷气推进
内容:中段的设备舱 上段的伞舱组装好的伞舱
燃料
加隔热层不到1KG
【科创基金项目】小型涡轮泵的制作
lyhhjahj
2年10个月前
发表于
喷气推进
动手实践: 实验报导
内容:先上泵的参数:轴转速:120r/s涡轮叶片数:8
燃料
泵流量:100ml/s氧化剂泵流量:50ml/s比转速:2000再上设计方案:我先将整个泵分成5个部分:1、3是泵部分,2放轴承和隔热,5是涡轮。
MSFRM-IA 模型火箭发动机
kc276644985
9年3个月前
发表于
喷气推进
内容:我没有做推力测试,KNSU
燃料
烧起来不好看,不发视屏了 重要的是重复使用可行性的验证。
30mm金属knsb发动机研制及试车
Catal
3年1个月前
发表于
喷气推进
动手实践: 实验报导
内容:但是因此我做药柱时还专门拿四氟乙烯定制了模具……药柱制作时由于我在学校里没能拍到照片,不过热熔法knsb也是常用的方法了,也没什么要拍的试车药柱制作完成后进行装机~之后我就迫不及待地去进行了试车试车过程好看的瞬间
燃料
测试总结我个人认为这次的试车还算不错
【转自广州日报】古法锻造汉唐刀剑
猫头_Official
11年4个月前
发表于
极客DIY
内容:“古法锻造以木炭为
燃料
,炉温较低,冶炼出的钢铁是海绵状的。,首先,传统
燃料
不是煤炭,而是密致的硬木烧制成的木炭。,这种
燃料
可以在炼钢缺氧的环境下对铁砂涔碳,锻打时有效地减少钢铁中碳元素的流失,使锻造出来的刀刃具有更强的攻击性。
【廣局神作】RNX-75規格發動機試車
焓熵`
12年8个月前
回复于
喷气推进
内容: 嘎嘎~ 今天中午,備齊所有裝備 發動機數據如下:殼體材質:40Cr噴口堵頭材質:45#噴吼材質:熱解石墨(可千萬別小看這東西強度,簡直要命)有效燃燒室長度 600mm(不包含密封件厚度,單純
燃料
長度總和
《导弹总体结构设计网络课程》
虎哥
16年6个月前
回复于
喷气推进
内容:带有助推级的有翼导弹,其主要设计参数有主级推重比(或),比冲,
燃料
相对质量系数,翼载和助推级工作结束时的速度和时间等。
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