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1990 Vol. 20, No. 4

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VARIATIONAL PRINCIPLE OF INSTABILITY OF ATMOSPHERIC MOTIONS (I)
1990, 20(4): 435-451. doi: 10.6052/1000-0992-1990-4-J1990-046
Abstract(1723) PDF(685)
Abstract:
THE THEORY OF BUMPS IN COAL MINES——An Introduction to the Study of Mining Mechanics at the T.U.Munich, F.R.Germany (Invited)
1990, 20(4): 452-467. doi: 10.6052/1000-0992-1990-4-J1990-047
Abstract(1961) PDF(914)
Abstract:
This paper gives a review on the theory of bumps in coal mines at the Technical University of Munich, F.R.Germany. At first, the steep post-failure decrease of the material parameters is considered as the main characteristics of the material responsible for its pronencss to rock bursting. Then a simplified elasto-plastic theory, referred as an elementary theory in the text, is applied to the translatory bumps and some basic mechanisms of the bump are revealed. It is followed by a discussion on the effects o...
FRACTALS IN DAMAGE AND FRACTURE OF MATERIALS
1990, 20(4): 468-477. doi: 10.6052/1000-0992-1990-4-J1990-048
Abstract(2056) PDF(1399)
Abstract:
The applications of fractal geometry to damage fracture of materials arc reviewed. The irregularity and roughness of fractured surface can be quantitatively represented by fractal dimension which is in turn related to fracture toughness. The damage evolution process is similar to percolation, and the unusual behavior of some properties at fracture or fragmentation is often related to certain scaling relations. These studies on complexity of fracture and physical mechanism of damage fracture are very importa...
PDF METHODS IN TURBULENT COMBUSTION
1990, 20(4): 478-787. doi: 10.6052/1000-0992-1990-4-J1990-049
Abstract(2689) PDF(983)
Abstract:
The probability density function (pelf) methods to solve the joint pdf equation of velocity and thermo-chcmical parameters for turbulent combustion are very promising, because the turbulent transfer and chemical reaction can beciliated correctly. IT can provide more information than other conventional turbulent models. In this paper the evolution equations for pdf of turbulent combustion arc derived. Some common stochastic models and Monte Carlo algorithm for solving the pdf equations are introduced. Two ex...
ON THE RESEARCH OF ABLATION PATTERNS
1990, 20(4): 488-498. doi: 10.6052/1000-0992-1990-4-J1990-050
Abstract(2043) PDF(684)
Abstract:
In this paper, the research on ablation patterns by Lin Tong-ji and his co-workers is introduced. It includes ablation patterns appearing on reentry vehicles, ground-test models and the Jilin Meteorites. It is found that the ablation pattern is controlled by the Reynolds number of the boundary layer on the ablation surface. Two kinds of typical ablation patterns: the ablation wedge and the cross-hatching are studied. Transition Reynolds numbers for both the reentry vehicles and the test models are obtained.
SURVEY OF IV INTERNATIONAL WORKSHOP ON NONLINEAR AND TURBULENT PROCESSES IN PHYSICS
1990, 20(4): 499-505. doi: 10.6052/1000-0992-1990-4-J1990-051
Abstract(1862) PDF(691)
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1990, 20(4): 506-523. doi: 10.6052/1000-0992-1990-4-J1990-052
Abstract(1684) PDF(713)
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1990, 20(4): 524-537. doi: 10.6052/1000-0992-1990-4-J1990-053
Abstract(1289) PDF(721)
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1990, 20(4): 538-554. doi: 10.6052/1000-0992-1990-4-J1990-054
Abstract(1615) PDF(614)
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1990, 20(4): 555-561. doi: 10.6052/1000-0992-1990-4-J1990-055
Abstract(1375) PDF(592)
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1990, 20(4): 562-572. doi: 10.6052/1000-0992-1990-4-J1990-056
Abstract(1233) PDF(601)
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1990, 20(4): 573-575. doi: 10.6052/1000-0992-1990-4-J1990-057
Abstract(1153) PDF(502)
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