پایان نامه تحلیل و اصلاح راه گاه خنک‌ کاری موتور EF7

فهرست:

فهرست اشکال.. ش‌

فهرست جداول.. ع‌

فهرست علائم. غ‌

فصل اول: دیباچه. 1

1-1- اهمیت انتقال حرارت در موتورهای احتراق داخلی.. 2

1-2- روش‌های بهبود عملکرد سامانه‌ی خنک‌کاری.. 3

فصل دوم: پیشینه مطالعات.. 6

2-1- مقدمه. 7

2-2- تغییر هندسه‌ی جریان. 7

2-3- پیشینه‌ی مطالعات خنک‌کاری دقیق.. 9

2-4- جوشش... 20

2-5- پیشینه‌ی مطالعات جوشش در موتورهای احتراق داخلی.. 25

فصل سوم: مطالعات تجربی.. 46

3-1- مقدمه. 47

3-2- دستگاه آزمایشگاهی جوشش... 47

3-2-1- مخزن. 48

3-2-2- گرمکن مخزن. 48

3-2-3- پمپ.. 49

3-2-4- شیر سه‌راهه. 49

3-2-5- فشار سنج. 49

3-2-6- کانال. 50

3-2-7 روتامتر. 50

3-2-8 کویل مسی. 51

3-2-9- بخش مورد آزمایش... 51

3-2-10- بلوک مسی. 52

3-2-11- گرمکن استوانه‌ای.. 52

3-2-12- عایق PTFE. 52

3-2-13- روغن انتقال حرارت.. 53

3-2-14- رئوستا 53

3-2-15- ترموکوپل. 54

3-2-16- سیتم داده بردار 54

3-2-17- سمباده 54

3-2-18- زبری سنج. 55

3-2-19- رله وکنترلر. 56

3-3- نتایج دستگاه جوشش جریانی.. 57

3-3-1- نمودارهای تجربی انتقال حرارت جوشش... 57

3-3-2- آنالیز خطا 61

3-4- مطالعه آزمایشگاهی حرکت سیال با استفاده از روش PIV. 62

3-4-1- آشنایی با روش PIV. 63

3-4-2- اجزای به‌کار رفته در آزمایش PIV برای سرسیلندر موتور احتراق داخلی. 65

3-4-3- نقاط اندازه‌گیری شده‌ی سرعت در سرسیلندر 69

3-4-4- تحلیل و اندازه گیری سرعت با استفاده از روش PIV. 70

فصل چهارم: شبیه‌سازی عددی.. 73

4-1- مقدمه. 74

4-2- شبیه‌سازی عددی جوشش جریانی مادون سرد. 74

4-2-1- روش چن. 75

4-2-2- روش BDL. 76

4-2-3- ضریب انتقال حرارت جابه‌جایی اجباری خالص، hfc 82

4-2-4- ضریب انتقال حرارت جوشش هسته‌ای، hnb 83

4-3- شبیه‌سازی یک‌بعدی جریان خنک‌کننده در راهگاه خنک‌کاری موتور 92

4-4- شبیه‌سازی سه‌بعدی جریان خنک‌کننده در راهگاه خنک‌کاری موتور 96

4-4-1- شبیه‌سازی جریانی خنک‌کننده در راهگاه موتور 96

4-4-2- شبیه‌سازی حرارتی جریان خنک‌کننده در راهگاه خنک‌کاری موتور 105

فصل پنجم: راهکارهای بهبود خنک‌کاری.. 113

5-1- مقدمه. 114

5-2- ارائه‌ی روش‌هایی در راستای رسیدن به خنک‌کاری یکنواخت در موتور 114

5-2-1- روش تغییر الگوی ورودی و خروجی خنک‌کننده 114

5-2-2- استفاده از رژیم جوشش جریانی به منظور افزایش ضریب انتقال حرارت.. 119

فصل ششم: جمع‌بندی و نتیجه گیری.. 129

6-1- جمع‌بندی و نتیجه‌گیری.. 130

6-2- نوآوری‌ها 132

6-3- پیشنهادها برای ادامه کار 133

6-4- محصولات علمی ارائه شده 134

منابع و مآخذ. 136

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