How to land on a planet safely
Simulations capture the interaction between a rocket plume and the
surface and find ways to make planetary descents and ascents safer

Date:
April 25, 2023
Source:
American Institute of Physics
Summary:
Researchers develop a model to describe the interaction between
a rocket plume and the surface of a planetary body in near-vacuum
conditions. The computational framework takes in information about
the rocket, its engines, and the surface composition and topography,
as well as the atmospheric conditions and gravitational forces
at the landing site, and the results can be used to evaluate the
safety and feasibility of a proposed landing site and to optimize
the design of spacecraft and rocket engines for planetary landings.


Facebook Twitter Pinterest LinkedIN Email

==========================================================================
FULL STORY ==========================================================================
When a lander descends toward the moon -- or a rocky planet, asteroid,
or comet -- the exhaust plume of the rocket interacts with the surface,
causing erosion and kicking up regolith particles. The resulting
blanket of dusty debris can create a dangerous brownout effect, limiting visibility and potentially damaging the spacecraft or nearby equipment.

InPhysics of Fluids, by AIP Publishing, researchers from Chungnam National University, the University of Edinburgh, Gyeongsang National University,
and the Korea Institute of Science and Technology Information developed a
model to describe the interaction between a rocket plume and the surface
of a planetary body in near-vacuum conditions. The results can be used
to evaluate the safety and feasibility of a proposed landing site and
to optimize the design of spacecraft and rocket engines for planetary
landings.

"Understanding the interaction between the rocket plume and the surface
is important for the safety and success of space missions in terms of contamination and erosion, landing accuracy, planetary protection, and engineering design, as well as for scientific understanding and future exploration," said author Byoung Jae Kim of Chungnam National University.

The computational framework takes in information about the rocket,
its engines, and the surface composition and topography, as well as the atmospheric conditions and gravitational forces at the landing site.

By considering the interaction of the gas with solid particles as a
system of equations, the simulation estimates the shape and size of the
plume, the temperature and pressure of the plume and surface, and the
amount of material eroded or displaced. It does so in a way that is more computationally efficient than previous methods.

"Our tool can simulate the plume surface interaction problem at the
fundamental level (e.g., scour pattern formation and development of
erosion models) and for practical engineering applications (e.g.,
predicting particle trajectories to avoid damage to the lander and
previously established sites and planning descend/ascend scenarios),"
said Kim.

In the model, small regolith particles reached high altitudes and caused
severe brownout effects during ascent and descent. In contrast, larger particles with increased bed height led to a more favorable brownout
status.

"The insights gained from this study of the effects of different
parameters on plume-surface interaction can inform the development of
more effective and efficient landing technologies," said Kim. "The study
also sheds light on the festooned scour patterns that can be observed on planetary surfaces, which can provide valuable information for future scientific investigations of planetary bodies." The researchers plan
to improve the capabilities of the framework to include more complex
physics, such as chemical reactions and solid particle collisions.

They believe the model can be applied to other physics scenarios including needle-free drug delivery systems.

* RELATED_TOPICS
o Space_&_Time
# Moon # Sun # Space_Probes # Space_Exploration #
Solar_Flare # Nebulae # Astronomy # Astrophysics
* RELATED_TERMS
o Rocket_engine o Model_rocket o Rocket o Spacecraft_propulsion
o Solid-fuel_rocket o Multistage_rocket o Water_rocket o
Hybrid_rocket

========================================================================== Story Source: Materials provided by American_Institute_of_Physics. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Omid Ejtehadi, Rho Shin Myong, I. Sohn, B.J. Kim. Full continuum
approach
for simulating plume-surface interaction in planetary
landings. Physics of Fluids, 2023; DOI: 10.1063/5.0143398 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2023/04/230425111142.htm

--- up 1 year, 8 weeks, 1 day, 10 hours, 50 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)