PRESENTATION - Experimental Duplication of Venus Atmospheric Entry Flow.

Experimental Duplication of Venus Atmospheric Entry Flow 11th VEXAG meeting

G. de Crombrugghe, R. Morgan, T. J. McIntyre, F. Zander Centre for Hypersonics & The University of Queensland

20/11/2013

1/6

Challenges of Venus exploration −1

10

• 11 · · · 12 km/s entry velocity; • 15 · · · 50 gs peak deceleration; • 3 · · · 40 MW /m2 peak heat flux; • ∼ 50% radiative heating;

Free−stream density [kg/m3]

Mars direct ballistic entry Pioneer Venus Day probe, 1978 −2

10

−3

10

−4

10

0

Slowest Venus entry Vega 1, 1984

2

4

6 8 Flight velocity [km/s]

10

12

• sulphuric acid cloud layer; • up to 100 m/s high altitude winds; • > 725 K surface temperature; • 9, 200 kPa surface pressure.

2/6

The X2 expansion tube

3/6

Pioneer Venus multiprobe

4/6

Result: Venus entry conditions achievable!

1/10 model −1

Free−stream density [kg/m3]

10

Flight

−2

10

−3

10

Day probe North probe Night probe Peak radiative heating Peak total heating x2s2189 x2s2194 x2s2195

−4

10

0

2

4

6 8 10 Equivalent flight velocity [km/s]

12

14

5/6

9,69

45°

49,31

45 ,71

R 25

1,94

A

R

5

10

17°

O4

SECTION A/A

30

B

R8

R2 0

P / 2 DEE

16 O

4

31,7 6

O

4

7

2,8

A

O

2,2

/2

DE

EP

M6 / 7,5 DEEP

5

REV

5 R 0,

SECTION B/B

5 R 0,

REVISION HISTORY DESCRIPTION

NAME DATE DRAWN Guerric 11/12/13 CHECKED ENG APPR MGR APPR UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN MILLIMETERS ANGLES ±X.X° 2 PL ±X.XX 3 PL ±X.XXX

SHEET 1 OF 1

Solid Edge A2 FILE NAME: pioneer_venus.dft SCALE: WEIGHT:

SIZE DWG NO

TITLE REV

APPROVED

O 2,2 / 2 DEEP

DATE

Material: stainless steel.

Quantity: 1. g.decrombrugghe@uq.edu.au

M6 / 7,5 DEEP

25 25

16

11

R5

O 2,2

O4

B

Models

0

6/6

5