| Schmidt-Appleman-Criterion (SAC) |
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| This file: |
https://purl.org/aero/SAC |
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Magnus-Equation |
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| a_w |
611,2 |
Pa |
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| b_w |
17,62 |
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| c_w |
243,12 |
°C |
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| a_i |
611,2 |
Pa |
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| b_i |
22,46 |
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| c_i |
272,62 |
°C |
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https://de.wikipedia.org/wiki/Sättigungsdampfdruck#Berechnung_des_Sättigungsdampfdrucks_von_Wasser_über_die_Magnus-Formel |
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https://en.wikipedia.org/wiki/Vapour_pressure_of_water |
contains also alternative
equations |
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| t |
-43,9 |
°C |
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No contrail above this
temperatur |
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| E_w' |
1,354 |
Pa/°C |
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| E_w' - G |
-1,89506E-07 |
Pa/°C |
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<= drive to Zero with
the Solver (settings on the right) |
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=
a_w*b_w*c_w*EXP(b_w*t/(c_w+t))/(c_w+t)^2-G |
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| E_w |
12,54 |
Pa |
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= a_w*EXP(b_w*t/(c_w+t)) |
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| E_i |
8,17 |
Pa |
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= a_i*EXP(b_i*t/(c_i+t)) |
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| L |
1,9812E-03 |
°C/ft |
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| t_0 |
15,0 |
°C |
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| k_a |
6,8756E-06 |
1/ft |
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Constants of the ISA,
Scholz |
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| k_b |
4,8063E-05 |
1/ft |
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| k_exp |
5,25588 |
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| H_T |
36089 |
ft |
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| p_0 |
101315 |
Pa |
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| p_T |
22632 |
Pa |
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| H |
40000 |
ft |
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Input of the flight
altitude |
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| p |
18754 |
Pa |
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Pressure from the ISA,
Scholz |
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=
WENN(H<H_T;p_0*(1-k_a*H)^k_exp;p_T*EXP(-k_b*(H-H_T))) |
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| EI_H2O |
1,25 |
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Data for Kerosine |
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| c_p |
1004 |
J/(kgK) |
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| eps |
0,622 |
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|
GIERENS, Klaus, et
al.,2008. A Review of Various Strategies for Contrail Avoidance. In: OASC,
vol.2, pp. 1-7. |
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| Q |
4,30E+07 |
J/kg |
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https://doi.org/10.2174/1874282300802010001 |
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| eta |
0,35 |
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| G |
1,354 |
Pa/°C |
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=
EI_H2O*p*c_p/(eps*Q*(1-eta)) |
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| G0 |
72,0 |
Pa |
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= E_w-G*t |
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| f(t) |
12,54 |
Pa |
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= G*t+G0 |
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| f(t)=E_w(t) ? |
true |
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| t |
E_w |
E_i |
G*t+G0 |
phi = E_i/E_w |
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| -60 |
1,901 |
1,080 |
-9,21 |
56,8% |
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| -59 |
2,158 |
1,236 |
-7,86 |
57,3% |
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| -58 |
2,447 |
1,413 |
-6,50 |
57,7% |
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| -57 |
2,771 |
1,613 |
-5,15 |
58,2% |
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| -56 |
3,134 |
1,839 |
-3,79 |
58,7% |
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| -55 |
3,539 |
2,094 |
-2,44 |
59,2% |
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| -54 |
3,992 |
2,381 |
-1,09 |
59,7% |
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| -53 |
4,497 |
2,705 |
0,27 |
60,2% |
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| -52 |
5,060 |
3,070 |
1,62 |
60,7% |
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| -51 |
5,686 |
3,479 |
2,98 |
61,2% |
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| -50 |
6,382 |
3,939 |
4,33 |
61,7% |
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| -49 |
7,155 |
4,455 |
5,68 |
62,3% |
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| -48 |
8,011 |
5,032 |
7,04 |
62,8% |
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|
|
|
|
|
|
|
|
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|
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|
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| -47 |
8,960 |
5,678 |
8,39 |
63,4% |
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|
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|
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| -46 |
10,010 |
6,401 |
9,74 |
63,9% |
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|
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| -45 |
11,171 |
7,208 |
11,10 |
64,5% |
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|
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| -44 |
12,452 |
8,108 |
12,45 |
65,1% |
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|
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| -43 |
13,865 |
9,111 |
13,81 |
65,7% |
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|
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| -42 |
15,423 |
10,227 |
15,16 |
66,3% |
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| -41 |
17,137 |
11,469 |
16,51 |
66,9% |
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|
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| -40 |
19,021 |
12,850 |
17,87 |
67,6% |
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| -39 |
21,092 |
14,382 |
19,22 |
68,2% |
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| -38 |
23,364 |
16,082 |
20,57 |
68,8% |
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| -37 |
25,855 |
17,966 |
21,93 |
69,5% |
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| -36 |
28,584 |
20,051 |
23,28 |
70,1% |
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| -35 |
31,571 |
22,358 |
24,64 |
70,8% |
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| -34 |
34,836 |
24,908 |
25,99 |
71,5% |
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| -33 |
38,403 |
27,723 |
27,34 |
72,2% |
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| -32 |
42,297 |
30,830 |
28,70 |
72,9% |
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| -31 |
46,543 |
34,254 |
30,05 |
73,6% |
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| -30 |
51,169 |
38,025 |
31,41 |
74,3% |
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| -29 |
56,205 |
42,175 |
32,76 |
75,0% |
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| -28 |
61,683 |
46,739 |
34,11 |
75,8% |
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| -27 |
67,636 |
51,753 |
35,47 |
76,5% |
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| -26 |
74,102 |
57,258 |
36,82 |
77,3% |
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| -25 |
81,117 |
63,297 |
38,17 |
78,0% |
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| Minimum Relative Humidity for Persistent Contrails |
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| according
to Gierens (2008) |
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| exact: |
RH_min = E_i(t) / E_w(t) |
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| approx.: |
RH_min = RH_a*t + RH_b |
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| |
RH_a |
6,059E-03 |
1/°C |
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RH_b |
0,92261 |
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| |
This according to: |
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| |
GIERENS, Klaus, et
al.,2008. A Review of Various Strategies for Contrail Avoidance. In: OASC,
vol.2, pp. 1-7. |
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https://doi.org/10.2174/1874282300802010001 |
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| Checking
the Influence of the Altitude of the Tropopause on Pressure |
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| p(H, H_T) |
hPa |
p_0 = |
1013,15 |
hPa |
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| H |
ft |
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20000 |
25000 |
30000 |
35000 |
36089 |
40000 |
45000 |
50000 |
55000 |
60000 |
65000 |
70000 |
|
title of legend |
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| H_T |
ft |
20000 |
466 |
366 |
288 |
226 |
215 |
178 |
140 |
110 |
87 |
68 |
54 |
42 |
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H_T = 20000 ft |
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36089 |
466 |
376 |
301 |
238 |
226 |
188 |
147 |
116 |
91 |
72 |
56 |
44 |
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H_T = 36089 ft |
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50000 |
466 |
376 |
301 |
238 |
226 |
187 |
145 |
111 |
87 |
68 |
54 |
42 |
|
H_T = 50000 ft |
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70000 |
466 |
376 |
301 |
238 |
226 |
187 |
145 |
111 |
83 |
62 |
45 |
32 |
|
H_T = 70000 ft |
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| Result: |
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| The
influence of the altitude of the tropopause, H_T on the pressure is small! |
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| Further
approach: |
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| The
SAC and SAD is calculated with a standard H_T = 36089 ft, |
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| even
if later the SAD is evaluated for the temperatures of various other H_T. |
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