Abstract
In industrial applications, fluid-structure interaction
simulations often suffer from accuracy problems. For simulations
to pressurized water nuclear reactor cores, such an accuracy level
characterized by state-of-the-art simulation codes might require
to be improved for safety concerns. One approach to solving the
problem is through calibrations by high resolution experimental
data. In this paper, a fluid-structure interaction system with
close configurations as those in nuclear reactor cores is studied
experimentally: a sealed cylindrical rod of stainless steel made,
of 8.8/10 mm in I.D./O.D. and of 1.05 m in length is designed
to be free at one end and fixed at the other end by mounting
onto a coaxial Plexiglas tube. Through the annulus formed by
the rod and the tube, turbulent water flows are directed from
the free end to the fixed end of the rod. As the turbulent water
axially flows by the rod, the rod tends to vibrate as a pressure
difference across its cross section. From the experimental tests,
the vibrating amplitude of the rod subjected to water flows was
found to increase with Reynolds number, while the vibrating
frequency is reduced. Under identical conditions, the rod with a
blunt free-end had larger vibrating amplitude than that with a
tapered free-end, and a lower vibrating frequency. The vibrating
frequency of the rod was determined using both the free-end
shape and the loading material.
simulations often suffer from accuracy problems. For simulations
to pressurized water nuclear reactor cores, such an accuracy level
characterized by state-of-the-art simulation codes might require
to be improved for safety concerns. One approach to solving the
problem is through calibrations by high resolution experimental
data. In this paper, a fluid-structure interaction system with
close configurations as those in nuclear reactor cores is studied
experimentally: a sealed cylindrical rod of stainless steel made,
of 8.8/10 mm in I.D./O.D. and of 1.05 m in length is designed
to be free at one end and fixed at the other end by mounting
onto a coaxial Plexiglas tube. Through the annulus formed by
the rod and the tube, turbulent water flows are directed from
the free end to the fixed end of the rod. As the turbulent water
axially flows by the rod, the rod tends to vibrate as a pressure
difference across its cross section. From the experimental tests,
the vibrating amplitude of the rod subjected to water flows was
found to increase with Reynolds number, while the vibrating
frequency is reduced. Under identical conditions, the rod with a
blunt free-end had larger vibrating amplitude than that with a
tapered free-end, and a lower vibrating frequency. The vibrating
frequency of the rod was determined using both the free-end
shape and the loading material.
| Original language | English |
|---|---|
| Title of host publication | MACE PGR Conference 2017 |
| Pages | 1-4 |
| Publication status | Published - 1 Apr 2017 |