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Journal Articles

Numerical simulation of in-line and cross-flow oscillations of a cylinder

Watanabe, Tadashi; Kondo, Masaya

JSME International Journal, Series B, 49(2), p.296 - 301, 2006/05

no abstracts in English

Journal Articles

Wave propagation properties of frame structures; Formulation for three-dimensional frame structures

Nishida, Akemi

JSME International Journal, Series B, 49(2), p.360 - 367, 2006/05

Since it is generally difficult to predict the occurrence of natural disasters such as earthquakes, a performance management system that always maintains the safety and functionalities of structures is required, especially for critical ones like nuclear power plants. In order to realize such a system, it is becoming important to carry out modeling procedures and analyses in detail to better understand the real phenomena. The aim of our research is to solve the dynamic behavior, especially the wave propagation phenomena, of piping systems in nuclear power plants which are complicated assemblages of parts. The spectral element method is adopted in this work and the formulation considering a shear deformation independently for a frame element is described. The Timoshenko beam theory is introduced for the purpose of this formulation. Moreover, the validity of the presented element will be described through comparisons made with the conventional beam element by showing the numerical example using the steel pipe actually used as the piping in HTTR, JAEA.

Journal Articles

Development of a new thermochemical and electrolytic hybrid hydrogen production system for sodium cooled FBR

Nakagiri, Toshio; Kase, Takeshi; Kato, Shoichi; Aoto, Kazumi

JSME International Journal, Series B, 49(2), p.302 - 308, 2006/05

A new thermo-chemical and electrolytic hybrid hydrogen production system in lower temperature range is newly proposed by the Japan Atomic Energy Agency (JAEA) to realize the hydrogen production from water by using the heat generation of sodium cooled Fast Breader Reactor (FBR). The system is based on sulfuric acid (H $_{2}$ SO $_{4}$ ) synthesis and decomposition process developed earlier (Westinghouse process), and sulfur trioxide (SO $_{3}$ ) decomposition process is facilitated by electrolysis with ionic oxygen conductive solid electrolyte to reduce the operation temperature 200-300 $^{circ}$ C lower than Westinghouse process. SO $_{3}$ decomposition was confirmed experimentally, and theoretical thermal efficiency was evaluated. Furthermore, hydrogen production experiments to substantiate the whole process were performed. Stable hydrogen and oxygen production were observed in the experiments, and maximum duration of the experiments was about 5 hours.

Journal Articles

Solutions of partial differential equations with the CIP-BS method

Utsumi, Takayuki*; Kimura, Hideo

JSME International Journal, Series B, 47(4), p.761 - 767, 2004/11

In this paper, we show that a new numerical method, the Constrained Interpolation Profile - Basis Set (CIP-BS) method, can solve partial differential equations (PDEs) with high accuracy and can be a universal solver by presenting examples for the solutions of typical parabolic, hyperbolic, and elliptic equations. Here, we present the numerical errors caused by this method, and illustrate that the solutions by the CIP-BS $^{2}$ method, in which fifth order polynomials are used to constrain the values and first and second order spatial derivatives, are highly refined compared to those by the CIP-BS $^{1}$ method, in which third order polynomials are used to constrain the values and first order spatial derivatives. The fact that this method can unambiguously solve PDEs with an one-to-one correspondence to analytical requirements is also shown for PDEs including singular functions like the Dirac delta function with Dirichet or Neumann boundary conditions. This method is straightforwardly applicable to PDEs describing complex physical and engineering problems.

Journal Articles

Solutions of hyperbolic equations with the CIP-BS method

Utsumi, Takayuki*; Yabe, Takashi*; Aoki, Takayuki*; Koga, J. K.; Yamagiwa, Mitsuru

JSME International Journal, Series B, 47(4), p.768 - 776, 2004/11

no abstracts in English

Journal Articles

Development Method to Estimate the Complex Index of Refraction of Dielectric Aerosols

Kudo, Kazuhiko*; Li, H.*; Li, B.-X.*; Saito, Jun*; Yamaguchi, Akira; Takata, Takashi

JSME International Journal, Series B, 47(3), p.631 - 636, 2004/08

A method to estimate complex refractive index of dielectric aerosols is developed. For the purpose, three-dimensional radiative transfer problem in an absorbing-scattering media is solved by the Monte Carlo method. The Mie.s scattering theory is used to handle particle scattering and absorption. Magnesium oxide aerosol, whose complex index of refraction is well known, is selected as the example of the dielectric aerosol. Magnesium is burnt to produce MgO aerosol and the transmission of the radiation from a black body furnace through the aerosol layer is measured. By comparing the analytical results of transmitted energy profile along the wall facing the emission resource, black body furnace, obtained for a wide range of the complex index of refraction, with the experimental results, it is shown that the value of the complex refractive index of the aerosol can be estimated.

Journal Articles

Lead-bismuth eutectic compatibility with materials in the concept of spallation target for ADS

Kikuchi, Kenji; Saito, Shigeru; Kurata, Yuji; Futakawa, Masatoshi; Sasa, Toshinobu; Oigawa, Hiroyuki; Wakai, Eiichi; Umeno, Makoto*; Mizubayashi, Hiroshi*; Miura, Kuniaki*

JSME International Journal, Series B, 47(2), p.332 - 339, 2004/05

Lead bismuth eutectic (LBE) is favored by spallation neutron sources and coolant in the sub-critical reactor at the accelerator driven nuclear transmutation system (ADS). Technical issues of ADS are material technology of how to compromise with flowing lead bismuth, high-energy proton accelerator technology and a sub-critical reactor system technology. This paper describes LBE technology developed at JAERI. First a scenario in order to realize the ADS is shown. The concept of spallation target test facility is introduced with a target design of thermo-fluid dynamics. Base data of flow rate and temperature of Pb-Bi during LBE circulation are described. The results of LBE loop operation under the flowing conditions of target design concept are reported. The stagnant corrosion tests were done to know the controlling parameters among the various steels. The tube-type oxygen sensor with having the solid electrolyte was studied. Cleaning techniques were developed to remove LBE from materials.

Journal Articles

Research and development for gas turbine system in GTHTR300

Kunitomi, Kazuhiko; Katanishi, Shoji; Takada, Shoji; Takizuka, Takakazu; Yan, X.; Kosugiyama, Shinichi

JSME International Journal, Series B, 47(2), p.261 - 267, 2004/05

The GTHTR300 aiming at electric generation with its thermal efficiency of 46 % is a safe and economically competitive HTGR in 2010s. A helium gas turbine system connected with the reactor is designed based on existing technologies developed for fossil gas turbine systems. However, there are some uncertainties in performance of a helium gas compressor, electric magnetic bearings and control system. In order to confirm these technical uncertainties, a 1/3 scale model of the compressor and 1/3 scale magnetic bearings will be manufactured and tested in the simulated condition of the GTHTR300. This paper describes R&D plans focusing on the 1/3 scale compressor model test as well as unique design features of the GTHTR300.

Journal Articles

Numerical analysis of a water-vapor two-phase film flow in a narrow coolant channel with a three-dimensional rectangular rib

Takase, Kazuyuki; Yoshida, Hiroyuki; Ose, Yasuo*; Tamai, Hidesada

JSME International Journal, Series B, 47(2), p.323 - 331, 2004/05

no abstracts in English

Journal Articles

Pressure drop characteristics in tight-lattice bundles for reduced-moderation water reactors

Tamai, Hidesada; Kureta, Masatoshi; Yoshida, Hiroyuki; Akimoto, Hajime

JSME International Journal, Series B, 47(2), p.293 - 298, 2004/05

no abstracts in English

Journal Articles

Critical power in 7-rod tight lattice bundle

Liu, W.; Kureta, Masatoshi; Akimoto, Hajime

JSME International Journal, Series B, 47(2), p.299 - 305, 2004/05

Experimental research on critical power in tight lattice bundle that simulates the Reduced-Moderation Water Reactor (RMWR) has been carried out in Japan Atomic Energy Research Institute (JAERI). The bundle consists one center rod and six peripheral rods. The 7 rods are arranged on a 14.3 mm equilateral triangular pitch. Each rod is 13 mm in outside diameter. An axial 12-step power distribution is employed to simulate the complicate heating condition in RMWR. Experiments are carried out under = 100-1400 kg/m $^{2}$ s, $_{ex}$ = 2-8.5 MPa. Effects of mass velocity, inlet temperature, pressure, radial peaking factor and axial peaking factor on critical power and critical quality are discussed. Compared with axial uniform heating condition, the axial non-uniform heating condition causes an obvious decrease in critical quality. Arai correlation, which is the only correlation that has been optimized for tight lattice condition, is verified with the present experimental data. The correlation is found to be able to give reasonable prediction only around RMWR nominal operating condition.